21427388865

Names of 21427388865

• Cardinal: 21427388865 can be written as Twenty-one billion, four hundred twenty-seven million, three hundred eighty-eight thousand, eight hundred sixty-five.

Scientific notation

• Scientific notation: 2.1427388865 × 10¹⁰

Factors of 21427388865

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 1009

Divisors of 21427388865

• Number of divisors d(n): 96
• Complete list of divisors:
  1 3 5 9 15 27 45 81 101 135 243 283 303 405 505 617 849 909 1215 1415 1515 1851 2547 2727 3085 4245 4545 5553 7641 8181 9255 12735 13635 16659 22923 24543 27765 28583 38205 40905 49977 62317 68769 83295 85749 114615 122715 142915 149931 174611 186951 249885 257247 311585 343845 428745 523833 560853 749655 771741 873055 934755 1286235 1571499 1682559 2315223 2619165 2804265 3858705 4714497 5047677 6945669 7857495 8412795 11576115 14143491 15143031 17635711 23572485 25238385 34728345 42430473 52907133 70717455 75715155 88178555 158721399 212152365 264535665 476164197 793606995 1428492591 2380820985 4285477773 7142462955 21427388865
• Sum of all divisors σ(n): 39098457216
• Sum of proper divisors (its aliquot sum) s(n): 17671068351
• 21427388865 is a deficient number, because the sum of its proper divisors (17671068351) is less than itself. Its deficiency is 3756320514

Bases of 21427388865

• Binary: 10011111101001011000000000111000001₂
• Hexadecimal: 0x4FD2C01C1
• Base-36: 9UDBB29

Squares and roots of 21427388865

• 21427388865 squared (21427388865²) is 459132993571925988225
• 21427388865 cubed (21427388865³) is 9838021194017203496696486114625
• The square root of 21427388865 is 146380.9716629863
• The cube root of 21427388865 is 2777.5150259667

Scales and comparisons

• 21,427,388,865 seconds is equal to 681 years, 16 weeks, 6 days, 4 hours, 27 minutes, 45 seconds.
• To count from 1 to 21,427,388,865 would take you about one thousand, three hundred sixty-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 21427388865 cubic inches would be around 231.5 feet tall.

Recreational maths with 21427388865

• 21427388865 backwards is 56888372412
• The number of decimal digits it has is: 11
• The sum of 21427388865's digits is 54
• More coming soon!