21121978161235818

Names of 21121978161235818

• Cardinal: 21121978161235818 can be written as Twenty-one quadrillion, one hundred twenty-one trillion, nine hundred seventy-eight billion, one hundred sixty-one million, two hundred thirty-five thousand, eight hundred eighteen.

Scientific notation

• Scientific notation: 2.1121978161235818 × 10¹⁶

Factors of 21121978161235818

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 1797

Divisors of 21121978161235818

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 6 79 137 158 237 274 411 474 563 822 1013 1126 1689 2026 3039 3378 6078 10823 21646 32469 44477 64938 77131 80027 88954 133431 138781 154262 160054 231393 240081 266862 277562 316969 416343 462786 480162 570319 633938 832686 950907 1026169 1140638 1710957 1901814 2052338 3078507 3421914 6093349 6157014 10963699 12186698 18280047 21927398 25040551 32891097 36560094 43424753 45055201 50081102 65782194 75121653 78133703 81067351 86849506 90110402 130274259 135165603 140585153 150243306 156267406 162134702 234401109 243202053 260548518 270331206 281170306 321089597 421755459 468802218 486404106 577733147 642179194 843510918 963268791 1155466294 1733199441 1926537582 3430555487 3466398882 6172562537 6861110974 10291666461 11106227087 12345125074 18517687611 20583332922 22212454174 25366078163 33318681261 37035375222 43989274789 45640918613 50732156326 66637362522 76098234489 79149441139 87978549578 91281837226 131967824367 136922755839 152196468978 158298882278 237448323417 263935648734 273845511678 325263761761 474896646834 650527523522 975791285283 1951582570566 3475152708331 6252805849981 6950305416662 10425458124993 12505611699962 18758417549943 20850916249986 25695837179119 37516835099886 44561135361257 51391674358238 77087511537357 89122270722514 133683406083771 154175023074714 267366812167542 3520329693539303 7040659387078606 10560989080617909 21121978161235818
• Sum of all divisors σ(n): 43210272898926720
• Sum of proper divisors (its aliquot sum) s(n): 22088294737690902
• 21121978161235818 is an abundant number, because the sum of its proper divisors (22088294737690902) is greater than itself. Its abundance is 966316576455084

Bases of 21121978161235818

• Binary: 1001011000010100101001111000101010000010000011101101010₂
• Hexadecimal: 0x4B0A53C541076A
• Base-36: 5RZ46T7VUJU

Squares and roots of 21121978161235818

• 21121978161235818 squared (21121978161235818²) is 446137961443722827212997006129124
• 21121978161235818 cubed (21121978161235818³) is 9423316278512580948721835088485454802052321763432
• The square root of 21121978161235818 is 145334022.7243291371
• The cube root of 21121978161235818 is 276425.5589381937

Scales and comparisons

• 21,121,978,161,235,818 seconds is equal to 671,613,570 years, 49 weeks, 6 days, 2 hours, 50 minutes, 18 seconds.
• To count from 1 to 21,121,978,161,235,818 would take you about two billion, fourteen million, eight hundred forty thousand, seven hundred twelve 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 21121978161235818 cubic inches would be around 23035.5 feet tall.

Recreational maths with 21121978161235818

• 21121978161235818 backwards is 81853216187912112
• The number of decimal digits it has is: 17
• The sum of 21121978161235818's digits is 66
• More coming soon!