21655601721

Names of 21655601721

• Cardinal: 21655601721 can be written as Twenty-one billion, six hundred fifty-five million, six hundred one thousand, seven hundred twenty-one.

Scientific notation

• Scientific notation: 2.1655601721 × 10¹⁰

Factors of 21655601721

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 4337

Divisors of 21655601721

• Number of divisors d(n): 64
• Complete list of divisors:
  1 3 9 13 27 37 39 111 117 333 351 433 481 999 1299 1443 3851 3897 4329 5629 11553 11691 12987 16021 16887 34659 48063 50063 50661 103977 142487 144189 150189 151983 208273 427461 432567 450567 624819 1282383 1351701 1667483 1852331 1874457 3847149 5002449 5556993 5623371 15007347 16670979 21677279 45022041 50012937 61696871 65031837 185090613 195095511 555271839 585286533 802059323 1665815517 2406177969 7218533907 21655601721
• Sum of all divisors σ(n): 35575223040
• Sum of proper divisors (its aliquot sum) s(n): 13919621319
• 21655601721 is a deficient number, because the sum of its proper divisors (13919621319) is less than itself. Its deficiency is 7735980402

Bases of 21655601721

• Binary: 10100001010110001100100001000111001₂
• Hexadecimal: 0x50AC64239
• Base-36: 9Y56P89

Squares and roots of 21655601721

• 21655601721 squared (21655601721²) is 468965085898578161841
• 21655601721 cubed (21655601721³) is 10155721121274162073016976128361
• The square root of 21655601721 is 147158.4238873195
• The cube root of 21655601721 is 2787.3408853281

Scales and comparisons

• 21,655,601,721 seconds is equal to 688 years, 30 weeks, 1 day, 12 hours, 55 minutes, 21 seconds.
• To count from 1 to 21,655,601,721 would take you about one thousand, three hundred seventy-seven 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 21655601721 cubic inches would be around 232.3 feet tall.

Recreational maths with 21655601721

• 21655601721 backwards is 12710655612
• The number of decimal digits it has is: 11
• The sum of 21655601721's digits is 36
• More coming soon!