21491918557218

Names of 21491918557218

• Cardinal: 21491918557218 can be written as Twenty-one trillion, four hundred ninety-one billion, nine hundred eighteen million, five hundred fifty-seven thousand, two hundred eighteen.

Scientific notation

• Scientific notation: 2.1491918557218 × 10¹³

Factors of 21491918557218

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 447

Divisors of 21491918557218

• Number of divisors d(n): 90
• Complete list of divisors:
  1 2 3 6 9 18 53 106 159 318 389 477 778 954 1167 2334 2809 3501 5618 7002 8427 16854 20617 25281 41234 50562 61851 123702 148877 151321 185553 297754 302642 371106 446631 453963 893262 907926 1092701 1339893 1361889 2185402 2679786 2723778 3278103 6556206 7890481 8020013 9834309 15780962 16040026 19668618 23671443 24060039 47342886 48120078 57913153 71014329 72180117 115826306 142028658 144360234 173739459 347478918 425060689 521218377 850121378 1042436754 1275182067 2550364134 3069397109 3825546201 6138794218 7651092402 9208191327 18416382654 22528216517 27624573981 45056433034 55249147962 67584649551 135169299102 202753948653 405507897306 1193995475401 2387990950802 3581986426203 7163972852406 10745959278609 21491918557218
• Sum of all divisors σ(n): 47583642215109
• Sum of proper divisors (its aliquot sum) s(n): 26091723657891
• 21491918557218 is an abundant number, because the sum of its proper divisors (26091723657891) is greater than itself. Its abundance is 4599805100673

Bases of 21491918557218

• Binary: 100111000101111111010001010111101000000100010₂
• Hexadecimal: 0x138BFA2BD022
• Base-36: 7M991EJOI

Squares and roots of 21491918557218

• 21491918557218 squared (21491918557218²) is 461902563270091438739899524
• 21491918557218 cubed (21491918557218³) is 9927172271171039554133755209816364964232
• The square root of 21491918557218 is 4635937.7214559301
• The cube root of 21491918557218 is 27803.0044184989

Scales and comparisons

• 21,491,918,557,218 seconds is equal to 683,376 years, 27 weeks, 4 days, 9 hours, 18 seconds.
• To count from 1 to 21,491,918,557,218 would take you about one million, seven hundred eight thousand, four hundred forty-one 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 21491918557218 cubic inches would be around 2316.9 feet tall.

Recreational maths with 21491918557218

• 21491918557218 backwards is 81275581919412
• The number of decimal digits it has is: 14
• The sum of 21491918557218's digits is 63
• More coming soon!