21107931728

Names of 21107931728

• Cardinal: 21107931728 can be written as Twenty-one billion, one hundred seven million, nine hundred thirty-one thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 2.1107931728 × 10¹⁰

Factors of 21107931728

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 8950

Divisors of 21107931728

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 4 8 13 16 26 52 103 104 113 206 208 226 412 452 824 904 1339 1469 1648 1808 2678 2938 5356 5876 8719 10712 11639 11752 17438 21424 23278 23504 34876 46556 69752 93112 113347 139504 151307 186224 226694 302614 453388 605228 898057 906776 985247 1210456 1796114 1813552 1970494 2420912 3592228 3940988 7184456 7881976 11674741 12808211 14368912 15763952 23349482 25616422 46698964 51232844 93397928 101480441 102465688 186795856 202960882 204931376 405921764 811843528 1319245733 1623687056 2638491466 5276982932 10553965864 21107931728
• Sum of all divisors σ(n): 44868794880
• Sum of proper divisors (its aliquot sum) s(n): 23760863152
• 21107931728 is an abundant number, because the sum of its proper divisors (23760863152) is greater than itself. Its abundance is 2652931424

Bases of 21107931728

• Binary: 10011101010001000010111101001010000₂
• Hexadecimal: 0x4EA217A50
• Base-36: 9P348CW

Squares and roots of 21107931728

• 21107931728 squared (21107931728²) is 445544781833909065984
• 21107931728 cubed (21107931728³) is 9404528836716807200150519140352
• The square root of 21107931728 is 145285.6900317441
• The cube root of 21107931728 is 2763.6426963167

Scales and comparisons

• 21,107,931,728 seconds is equal to 671 years, 8 weeks, 4 days, 18 hours, 22 minutes, 8 seconds.
• To count from 1 to 21,107,931,728 would take you about one thousand, three hundred forty-two 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 21107931728 cubic inches would be around 230.3 feet tall.

Recreational maths with 21107931728

• 21107931728 backwards is 82713970112
• The number of decimal digits it has is: 11
• The sum of 21107931728's digits is 41
• More coming soon!