21491213898

Names of 21491213898

• Cardinal: 21491213898 can be written as Twenty-one billion, four hundred ninety-one million, two hundred thirteen thousand, eight hundred ninety-eight.

Scientific notation

• Scientific notation: 2.1491213898 × 10¹⁰

Factors of 21491213898

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 2111

Divisors of 21491213898

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 6 7 11 14 21 22 33 42 49 66 77 98 121 147 154 231 242 294 347 363 462 539 694 726 847 1041 1078 1617 1694 1741 2082 2429 2541 3234 3482 3817 4858 5082 5223 5929 7287 7634 10446 11451 11858 12187 14574 17003 17787 19151 22902 24374 26719 34006 35574 36561 38302 41987 51009 53438 57453 73122 80157 83974 85309 102018 114906 125961 134057 160314 170618 187033 210661 251922 255927 268114 293909 374066 402171 421322 511854 561099 587818 604127 631983 804342 881727 938399 1122198 1208254 1263966 1474627 1763454 1812381 1876798 2057363 2815197 2949254 3624762 4114726 4228889 4423881 5630394 6172089 6645397 8457778 8847762 10322389 12344178 12686667 13290794 19936191 20644778 25373334 29602223 30967167 39872382 46517779 59204446 61934334 73099367 88806669 93035558 139553337 146198734 177613338 219298101 279106674 325624453 438596202 511695569 651248906 976873359 1023391138 1535086707 1953746718 3070173414 3581868983 7163737966 10745606949 21491213898
• Sum of all divisors σ(n): 55148681952
• Sum of proper divisors (its aliquot sum) s(n): 33657468054
• 21491213898 is an abundant number, because the sum of its proper divisors (33657468054) is greater than itself. Its abundance is 12166254156

Bases of 21491213898

• Binary: 10100000000111110011110011001001010₂
• Hexadecimal: 0x500F9E64A
• Base-36: 9VFBARU

Squares and roots of 21491213898

• 21491213898 squared (21491213898²) is 461872274809588354404
• 21491213898 cubed (21491213898³) is 9926195851488700545826194306792
• The square root of 21491213898 is 146598.8195655069
• The cube root of 21491213898 is 2780.2700554553

Scales and comparisons

• 21,491,213,898 seconds is equal to 683 years, 18 weeks, 2 days, 21 hours, 38 minutes, 18 seconds.
• To count from 1 to 21,491,213,898 would take you about one thousand, three hundred sixty-six 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 21491213898 cubic inches would be around 231.7 feet tall.

Recreational maths with 21491213898

• 21491213898 backwards is 89831219412
• The number of decimal digits it has is: 11
• The sum of 21491213898's digits is 48
• More coming soon!