21157351215

Names of 21157351215

• Cardinal: 21157351215 can be written as Twenty-one billion, one hundred fifty-seven million, three hundred fifty-one thousand, two hundred fifteen.

Scientific notation

• Scientific notation: 2.1157351215 × 10¹⁰

Factors of 21157351215

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 48657

Divisors of 21157351215

• Number of divisors d(n): 128
• Complete list of divisors:
  1 3 5 7 11 13 15 21 29 33 35 39 55 65 77 87 91 105 143 145 165 195 203 231 273 319 377 385 429 435 455 609 715 957 1001 1015 1131 1155 1365 1595 1885 2145 2233 2639 3003 3045 4147 4785 5005 5655 6699 7917 11165 12441 13195 15015 20735 29029 33495 39585 48589 62205 87087 145145 145767 242945 340123 435435 534479 631657 728835 1020369 1409081 1603437 1700615 1894971 2672395 3158285 3741353 4227243 4421599 5101845 6948227 7045405 8017185 9474855 9863567 11224059 13264797 15499891 18318053 18706765 20844681 21136215 22107995 29590701 34741135 46499673 48637589 49317835 54954159 56120295 66323985 77499455 91590265 104223405 108499237 128226371 145912767 147953505 201498583 232498365 243187945 274770795 325497711 384679113 542496185 604495749 641131855 729563835 1007492915 1410490081 1627488555 1923395565 3022478745 4231470243 7052450405 21157351215
• Sum of all divisors σ(n): 47019571200
• Sum of proper divisors (its aliquot sum) s(n): 25862219985
• 21157351215 is an abundant number, because the sum of its proper divisors (25862219985) is greater than itself. Its abundance is 4704868770

Bases of 21157351215

• Binary: 10011101101000100111000111100101111₂
• Hexadecimal: 0x4ED138F2F
• Base-36: 9PWJGOF

Squares and roots of 21157351215

• 21157351215 squared (21157351215²) is 447633510434861976225
• 21157351215 cubed (21157351215³) is 9470739395873742211041304863375
• The square root of 21157351215 is 145455.6675245073
• The cube root of 21157351215 is 2765.7978317373

Scales and comparisons

• 21,157,351,215 seconds is equal to 672 years, 38 weeks, 2 days, 18 hours, 15 seconds.
• To count from 1 to 21,157,351,215 would take you about one thousand, three hundred forty-five 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 21157351215 cubic inches would be around 230.5 feet tall.

Recreational maths with 21157351215

• 21157351215 backwards is 51215375112
• 21157351215 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21157351215's digits is 33
• More coming soon!