21018370665

Names of 21018370665

• Cardinal: 21018370665 can be written as Twenty-one billion, eighteen million, three hundred seventy thousand, six hundred sixty-five.

Scientific notation

• Scientific notation: 2.1018370665 × 10¹⁰

Factors of 21018370665

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 6106

Divisors of 21018370665

• Number of divisors d(n): 64
• Complete list of divisors:
  1 3 5 15 17 19 51 57 85 95 255 285 323 829 969 1615 2487 4145 4845 5233 12435 14093 15699 15751 26165 42279 47253 70465 78495 78755 88961 99427 211395 236265 266883 267767 298281 444805 497135 803301 1334415 1338835 1491405 1690259 4016505 4338157 5070777 8451295 13014471 21690785 25353885 65072355 73748669 82424983 221246007 247274949 368743345 412124915 1106230035 1236374745 1401224711 4203674133 7006123555 21018370665
• Sum of all divisors σ(n): 37534060800
• Sum of proper divisors (its aliquot sum) s(n): 16515690135
• 21018370665 is a deficient number, because the sum of its proper divisors (16515690135) is less than itself. Its deficiency is 4502680530

Bases of 21018370665

• Binary: 10011100100110010101110001001101001₂
• Hexadecimal: 0x4E4CAE269
• Base-36: 9NLSMLL

Squares and roots of 21018370665

• 21018370665 squared (21018370665²) is 441771905411332542225
• 21018370665 cubed (21018370665³) is 9285325657318706664061813829625
• The square root of 21018370665 is 144977.1384218905
• The cube root of 21018370665 is 2759.7284382835

Scales and comparisons

• 21,018,370,665 seconds is equal to 668 years, 16 weeks, 4 days, 4 hours, 17 minutes, 45 seconds.
• To count from 1 to 21,018,370,665 would take you about one thousand, three hundred thirty-six years!

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 21018370665 cubic inches would be around 230 feet tall.

Recreational maths with 21018370665

• 21018370665 backwards is 56607381012
• The number of decimal digits it has is: 11
• The sum of 21018370665's digits is 39
• More coming soon!