21291764490

Names of 21291764490

• Cardinal: 21291764490 can be written as Twenty-one billion, two hundred ninety-one million, seven hundred sixty-four thousand, four hundred ninety.

Scientific notation

• Scientific notation: 2.129176449 × 10¹⁰

Factors of 21291764490

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 1719

Divisors of 21291764490

• Number of divisors d(n): 84
• Complete list of divisors:
  1 2 3 5 6 9 10 15 18 27 30 45 54 81 90 135 162 243 270 405 486 729 810 1215 1458 1709 2430 3418 3645 5127 7290 8545 10254 15381 17090 25635 30762 46143 51270 76905 92286 138429 153810 230715 276858 415287 461430 692145 830574 1245861 1384290 2076435 2491722 2920681 4152870 5841362 6229305 8762043 12458610 14603405 17524086 26286129 29206810 43810215 52572258 78858387 87620430 131430645 157716774 236575161 262861290 394291935 473150322 709725483 788583870 1182875805 1419450966 2129176449 2365751610 3548627415 4258352898 7097254830 10645882245 21291764490
• Sum of all divisors σ(n): 57495120534
• Sum of proper divisors (its aliquot sum) s(n): 36203356044
• 21291764490 is an abundant number, because the sum of its proper divisors (36203356044) is greater than itself. Its abundance is 14911591554

Bases of 21291764490

• Binary: 10011110101000101101000101100001010₂
• Hexadecimal: 0x4F5168B0A
• Base-36: 9S4KEMI

Squares and roots of 21291764490

• 21291764490 squared (21291764490²) is 453339235097624960100
• 21291764490 cubed (21291764490³) is 9652392227775372808794846849000
• The square root of 21291764490 is 145916.9780731495
• The cube root of 21291764490 is 2771.6425369715

Scales and comparisons

• 21,291,764,490 seconds is equal to 677 years, 4 days, 11 hours, 1 minute, 30 seconds.
• To count from 1 to 21,291,764,490 would take you about one thousand, three hundred fifty-four 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 21291764490 cubic inches would be around 231 feet tall.

Recreational maths with 21291764490

• 21291764490 backwards is 09446719212
• 21291764490 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21291764490's digits is 45
• More coming soon!