Recognised as Decimal number
2.1 × 10^16
- Positive
- Decimal
- 0 d.p.
- Exact fraction
- 2 s.f.
2.1 × 10^16 is a decimal number equal to 21,000,000,000,000,000⁄1. It lies between 21,000,000,000,000,000 and 21,000,000,000,000,000, and as a percentage it is 2.1 × 10^18%.
Number properties
Absolute value2.1 × 10^16
SignPositive
Integer part21,000,000,000,000,000
Fractional part0
Decimal places0
Ceiling21,000,000,000,000,000
Rounded to nearest21,000,000,000,000,000
Truncated21,000,000,000,000,000
Fractions & ratios
Ratio21,000,000,000,000,000 : 1
As a percentage2.1 × 10^18%
Reciprocal4.76190476 × 10^-17≈
Arithmetic
Double4.2 × 10^16
Half1.05 × 10^16
Square4.41 × 10^32
Cube9.261 × 10^48
Square root144,913,767.461894≈
Cube root275,892.417638112≈
Negation-2.1 × 10^16
Natural logarithm37.5832988326≈
Logarithm base 1016.3222192947≈
Representations
Decimal2.1 × 10^16
Scientific notation2.1 × 10^16
Exponential2.1e+16
IEEE 754 binary64 (hex)0x4352A6D8E1122000the exact 64-bit pattern stored
IEEE 754 binary32 (hex)0x5A9536C732-bit single precision, may lose accuracy
Rounding & precision
Significant figures as written2counted from the digits as typed, not from the value
To 0 decimal places21000000000000000
To 1 decimal place21000000000000000.0
To 2 decimal places21000000000000000.00
To 3 decimal places21000000000000000.000
To 4 decimal places21000000000000000.0000
To 1 significant figure2e+16
To 2 significant figures2.1e+16
To 3 significant figures2.1e+16
To 4 significant figures2.1e+16
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Neighbouring values
As a fraction
Also reads as
#021E15 (colour)
- #021E15
- Cyan
- Dark
- Nearest: Black
#021E15 is a cyan with RGB values 2, 30, 21 and HSL 161°, 88%, 6%. It is a dark colour, so white text on it reaches 17.5:1 contrast (AAA for normal text). The nearest named colour is Black.
Colour values
#021E15#021E15
HEX#021E15
RGBrgb(2, 30, 21)
RGB (0–1)0.0078, 0.1176, 0.0824
RGB percentages0.8%, 11.8%, 8.2%
HSLhsl(160.7, 87.5%, 6.3%)
HSV / HSBhsv(160.7, 93.3%, 11.8%)
CMYK93.3%, 0%, 30%, 88.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer138,773
CSS custom property--colour: #021E15;
Brightness & contrast
Relative luminance0.00996WCAG 2.x, 0 is black and 1 is white
Perceived brightness24.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.51:1
Contrast with white17.51:1WCAG normal text: AAA
Contrast with black1.2:1WCAG normal text: Fail
Greyscale equivalent#171717
Inverted#FDE1EA
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text17.51:1WCAG large text: AAA
Contrast with black, large text1.2:1WCAG large text: Fail
Named colours
Hue familycyan
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#1E020B
Analogous#021E07, #02191E
Triadic#15021E, #1E1502
Split complementary#1E0219, #1E0702
Tetradic#07021E, #1E020B, #191E02
Tints, shades & saturation
Channel breakdown
R2
G30
B21
Red2 (0.8%)
Green30 (11.8%)
Blue21 (8.2%)
Hue160.71°
Saturation (HSL)87.5%
Lightness6.27%
Dominant channelGreen
Hex per channelR 02 · G 1E · B 15
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Harmonies
Similar named colours
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