Number
210
- Positive
- Even
- Composite
- 3 digits
210 is an even 3-digit integer and a composite number. It has 16 divisors and a digital root of 3.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value210
Digit count3
Digit sum3
Digital root3repeated digit sum
PalindromicNoreads differently backwards
Triangular numberYes, the 20th triangular number
Happy numberNosquared-digit sums reach 1
Harshad numberYesdivisible by its own digit sum
Factors & divisors
Prime factorisation2 × 3 × 5 × 7
Distinct prime factors42, 3, 5, 7
Number of divisors16
Sum of divisors σ(n)576
Aliquot sum366sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)48integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 21016 in total
Arithmetic
Representations
Decimal210
Binary110100108 bits
Octal322
HexadecimalD2
Base 365U
Roman numeralCCX
In wordstwo hundred and ten
Ordinaltwo hundred and tenth
Scientific notation2.1 × 10^2
Engineering notation210
Nearest landmarks
Powers & multiples
210 to the power 244,100
210 to the power 39,261,000
210 to the power 41,944,810,000
210 to the power 5408,410,100,000
First ten multiples210, 420, 630, 840, 1,050, 1,260, 1,470, 1,680, 1,890, 2,100
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4No, remainder 2
Divisible by 5Yes
Divisible by 6Yes
Divisible by 7Yes
Divisible by 8No, remainder 2
Divisible by 9No, remainder 3
Divisible by 10Yes
Divisible by 11No, remainder 1
Divisible by 12No, remainder 6
Divisible by 100No, remainder 10
Collatz (3n + 1) trajectory
Steps to reach 139the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps210 → 105 → 316 → 158 → 79 → 238 → 119 → 358 → 179 → 538 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage21,000%
210% as a decimal2.1
210% of 100210
210% of 1,0002,100
As a fraction of 100210/100
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Derived from 210
Other readings
Also reads as
#221100 (colour)
- #221100
- Orange
- Dark
- Nearest: Black
#221100 is a orange with RGB values 34, 17, 0 and HSL 30°, 100%, 7%. It is a dark colour, so white text on it reaches 18.3:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#221100#221100
HEX#221100
HEX (short)#210
RGBrgb(34, 17, 0)
RGB (0–1)0.1333, 0.0667, 0
RGB percentages13.3%, 6.7%, 0%
HSLhsl(30, 100%, 6.7%)
HSV / HSBhsv(30, 100%, 13.3%)
CMYK0%, 50%, 100%, 86.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,232,576
CSS custom property--colour: #221100;
Brightness & contrast
Relative luminance0.00741WCAG 2.x, 0 is black and 1 is white
Perceived brightness22.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 18.29:1
Contrast with white18.29:1WCAG normal text: AAA
Contrast with black1.15:1WCAG normal text: Fail
Greyscale equivalent#131313
Inverted#DDEEFF
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text18.29:1WCAG large text: AAA
Contrast with black, large text1.15:1WCAG large text: Fail
Named colours
Hue familyorange
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#001122
Analogous#220000, #222200
Triadic#002211, #110022
Split complementary#002222, #000022
Tetradic#002200, #001122, #220022
Tints, shades & saturation
Channel breakdown
R34
G17
B0
Red34 (13.3%)
Green17 (6.7%)
Blue0 (0%)
Hue30°
Saturation (HSL)100%
Lightness6.67%
Dominant channelRed
Hex per channelR 22 · G 11 · B 00
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Harmonies
Similar named colours
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