Number
3,221
- Positive
- Odd
- Prime
- 4 digits
3,221 is an odd 4-digit integer and a prime number. It has 2 divisors and a digital root of 8.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value3,221
Digit count4
Digit sum8
Digital root8repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation3,221
Distinct prime factors13,221
Number of divisors2
Sum of divisors σ(n)3,222
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)3,220integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 3,2212 in total
Arithmetic
Previous number3,220
Next number3,222
Double6,442
Half1,610.5
Square10,374,841
Cube33,417,362,861
Square root56.753854495≈irrational, shown to 9 decimal places
Cube root14.768291011≈
Negation-3,221
Reciprocal0.0003104626≈
Representations
Decimal3,221
Binary11001001010112 bits
Octal6225
HexadecimalC95
Base 362HH
Roman numeralMMMCCXXI
In wordsthree thousand, two hundred and twenty-one
Ordinalthree thousand, two hundred and twenty-first
Scientific notation3.221 × 10^3
Engineering notation3.221 × 10^3
Nearest landmarks
Powers & multiples
3,221 to the power 210,374,841
3,221 to the power 333,417,362,861
3,221 to the power 4107,637,325,775,281
3,221 to the power 5346,699,826,322,180,101
First ten multiples3,221, 6,442, 9,663, 12,884, 16,105, 19,326, 22,547, 25,768, 28,989, 32,210
Powers of twoBetween 2^11 (2,048) and 2^12 (4,096)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 5
Divisible by 7No, remainder 1
Divisible by 8No, remainder 5
Divisible by 9No, remainder 8
Divisible by 10No, remainder 1
Divisible by 11No, remainder 9
Divisible by 12No, remainder 5
Divisible by 100No, remainder 21
Collatz (3n + 1) trajectory
Steps to reach 122the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps3,221 → 9,664 → 4,832 → 2,416 → 1,208 → 604 → 302 → 151 → 454 → 227 → …
Last steps… → 32 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage322,100%
3,221% as a decimal32.21
3,221% of 1003,221
3,221% of 1,00032,210
As a fraction of 1003,221/100
Read another way
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Derived from 3,221
Also reads as
3221 (year)
- Common year
- 365 days
- 33rd century
- Ox
3221 will be a common year of 365 days. It begins on a Friday and ends on a Friday. Easter Sunday falls on 4 April.
Structure of the year
Months of 3221
January31 days, starts Friday
February28 days, starts Monday
August31 days, starts Sunday
September30 days, starts Wednesday
October31 days, starts Friday
November30 days, starts Monday
December31 days, starts Wednesday
Time references
These values depend on today’s date and change daily.
Unix timestamp at the start39,477,801,600
Unix timestamp at the end39,509,337,599
Years from now1,195 years from now
Days from today436,213 days to 1 January
The number 3221
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Also reads as
#332222 (colour)
- #332222
- Red
- Dark
- Nearest: Black
#332222 is a red with RGB values 51, 34, 34 and HSL 0°, 20%, 17%. It is a dark colour, so white text on it reaches 15.1:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#332222#332222
HEX#332222
HEX (short)#322
RGBrgb(51, 34, 34)
RGB (0–1)0.2, 0.1333, 0.1333
RGB percentages20%, 13.3%, 13.3%
HSLhsl(0, 20%, 16.7%)
HSV / HSBhsv(0, 33.3%, 20%)
CMYK0%, 33.3%, 33.3%, 80%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,351,074
CSS custom property--colour: #332222;
Brightness & contrast
Relative luminance0.01963WCAG 2.x, 0 is black and 1 is white
Perceived brightness39.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 15.08:1
Contrast with white15.08:1WCAG normal text: AAA
Contrast with black1.39:1WCAG normal text: Fail
Greyscale equivalent#262626
Inverted#CCDDDD
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text15.08:1WCAG large text: AAA
Contrast with black, large text1.39:1WCAG large text: Fail
Named colours
Hue familyred
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#223333
Analogous#33222B, #332B22
Triadic#223322, #222233
Split complementary#22332B, #222B33
Tetradic#2B3322, #223333, #2B2233
Tints, shades & saturation
Channel breakdown
R51
G34
B34
Red51 (20%)
Green34 (13.3%)
Blue34 (13.3%)
Hue0°
Saturation (HSL)20%
Lightness16.67%
Dominant channelRed
Hex per channelR 33 · G 22 · B 22
Keep nerding
Every link below is a page Nerdulator can generate from what it already knows about this value.
Nerdulate something else
Nothing in mind? Surprise me · today’s page