21392840813742981

Names of 21392840813742981

• Cardinal: 21392840813742981 can be written as Twenty-one quadrillion, three hundred ninety-two trillion, eight hundred forty billion, eight hundred thirteen million, seven hundred forty-two thousand, nine hundred eighty-one.

Scientific notation

• Scientific notation: 2.1392840813742981 × 10¹⁶

Factors of 21392840813742981

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 4437425593

Divisors of 21392840813742981

• Number of divisors d(n): 72
• Complete list of divisors:
  1 3 9 11 19 33 57 99 121 171 209 233 363 627 699 1089 1881 2097 2299 2563 4427 6897 7689 13281 20691 23067 28193 39843 48697 84579 146091 253737 438273 535667 1607001 4821003 4437425327 13312275981 39936827943 48811678597 84311081213 146435035791 252933243639 439305107373 536928464567 758799730917 927421893343 1033920101191 1610785393701 2782265680029 3101760303573 4832356181103 8346797040087 9305280910719 10201640826773 11373121113101 19644481922629 30604922480319 34119363339303 58933445767887 91814767440957 102358090017909 125104332244111 176800337303661 216089301148919 375312996732333 648267903446757 1125938990196999 1944803710340271 2376982312638109 7130946937914327 21392840813742981
• Sum of all divisors σ(n): 35906403275084160
• Sum of proper divisors (its aliquot sum) s(n): 14513562461341179
• 21392840813742981 is a deficient number, because the sum of its proper divisors (14513562461341179) is less than itself. Its deficiency is 6879278352401802

Bases of 21392840813742981

• Binary: 1001100000000001010110011100101011100001000101110000101₂
• Hexadecimal: 0x4C00ACE5708B85
• Base-36: 5UN4NE9PYF9

Squares and roots of 21392840813742981

• 21392840813742981 squared (21392840813742981²) is 457653638082147449489719126766361
• 21392840813742981 cubed (21392840813742981³) is 9790511427321722961803431353163449322815490662141
• The square root of 21392840813742981 is 146262916.7415410905
• The cube root of 21392840813742981 is 277602.1464770853

Scales and comparisons

• 21,392,840,813,742,981 seconds is equal to 680,226,165 years, 24 weeks, 5 days, 3 hours, 16 minutes, 21 seconds.
• To count from 1 to 21,392,840,813,742,981 would take you about two billion, forty million, six hundred seventy-eight thousand, four hundred ninety-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 21392840813742981 cubic inches would be around 23133.5 feet tall.

Recreational maths with 21392840813742981

• 21392840813742981 backwards is 18924731804829312
• The number of decimal digits it has is: 17
• The sum of 21392840813742981's digits is 72
• More coming soon!