Number
121
- Positive
- Odd
- Composite
- Perfect square
- 3 digits
121 is an odd 3-digit integer and a composite number. It has 3 divisors and a digital root of 4.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityComposite
Absolute value121
Digit count3
Digit sum4
Digital root4repeated digit sum
PalindromicYesreads the same backwards
Perfect squareYes, 11²
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation11^2
Distinct prime factors111
Number of divisors3
Sum of divisors σ(n)133
Aliquot sum12sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)110integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 11, 1213 in total
Arithmetic
Representations
Decimal121
Binary11110017 bits
Octal171
Hexadecimal79
Base 363D
Roman numeralCXXI
In wordsone hundred and twenty-one
Ordinalone hundred and twenty-first
Scientific notation1.21 × 10^2
Engineering notation121
Nearest landmarks
Powers & multiples
121 to the power 214,641
121 to the power 31,771,561
121 to the power 4214,358,881
121 to the power 525,937,424,601
First ten multiples121, 242, 363, 484, 605, 726, 847, 968, 1,089, 1,210
Powers of twoBetween 2^6 (64) and 2^7 (128)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 1
Divisible by 4No, remainder 1
Divisible by 5No, remainder 1
Divisible by 6No, remainder 1
Divisible by 7No, remainder 2
Divisible by 8No, remainder 1
Divisible by 9No, remainder 4
Divisible by 10No, remainder 1
Divisible by 11Yes
Divisible by 12No, remainder 1
Divisible by 100No, remainder 21
Collatz (3n + 1) trajectory
Steps to reach 195the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps121 → 364 → 182 → 91 → 274 → 137 → 412 → 206 → 103 → 310 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage12,100%
121% as a decimal1.21
121% of 100121
121% of 1,0001,210
As a fraction of 100121/100
Read another way
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Derived from 121
Other readings
Also reads as
#112211 (colour)
- #112211
- Green
- Dark
- Nearest: Black
#112211 is a green with RGB values 17, 34, 17 and HSL 120°, 33%, 10%. It is a dark colour, so white text on it reaches 16.7:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#112211#112211
HEX#112211
HEX (short)#121
RGBrgb(17, 34, 17)
RGB (0–1)0.0667, 0.1333, 0.0667
RGB percentages6.7%, 13.3%, 6.7%
HSLhsl(120, 33.3%, 10%)
HSV / HSBhsv(120, 50%, 13.3%)
CMYK50%, 0%, 50%, 86.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer1,122,833
CSS custom property--colour: #112211;
Brightness & contrast
Relative luminance0.01304WCAG 2.x, 0 is black and 1 is white
Perceived brightness28.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 16.66:1
Contrast with white16.66:1WCAG normal text: AAA
Contrast with black1.26:1WCAG normal text: Fail
Greyscale equivalent#1D1D1D
Inverted#EEDDEE
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text16.66:1WCAG large text: AAA
Contrast with black, large text1.26:1WCAG large text: Fail
Named colours
Hue familygreen
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#221122
Analogous#1A2211, #11221A
Triadic#111122, #221111
Split complementary#1A1122, #22111A
Tetradic#111A22, #221122, #221A11
Tints, shades & saturation
Channel breakdown
R17
G34
B17
Red17 (6.7%)
Green34 (13.3%)
Blue17 (6.7%)
Hue120°
Saturation (HSL)33.33%
Lightness10%
Dominant channelGreen
Hex per channelR 11 · G 22 · B 11
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Harmonies
Similar named colours
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