21391357812

Names of 21391357812

• Cardinal: 21391357812 can be written as Twenty-one billion, three hundred ninety-one million, three hundred fifty-seven thousand, eight hundred twelve.

Scientific notation

• Scientific notation: 2.1391357812 × 10¹⁰

Factors of 21391357812

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 34491

Divisors of 21391357812

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 3 4 6 11 12 22 29 33 44 58 66 87 116 132 163 174 319 326 348 489 638 652 957 978 1276 1793 1914 1956 3586 3828 4727 5379 7172 9454 10758 14181 18908 21516 28362 34283 51997 56724 68566 102849 103994 137132 155991 205698 207988 311982 377113 411396 623964 754226 994207 1131339 1508452 1988414 2262678 2982621 3976828 4525356 5588129 5965242 10936277 11176258 11930484 16764387 21872554 22352516 32808831 33528774 43745108 61469419 65617662 67057548 122938838 131235324 162055741 184408257 245877676 324111482 368816514 486167223 648222964 737633028 972334446 1782613151 1944668892 3565226302 5347839453 7130452604 10695678906 21391357812
• Sum of all divisors σ(n): 56675566080
• Sum of proper divisors (its aliquot sum) s(n): 35284208268
• 21391357812 is an abundant number, because the sum of its proper divisors (35284208268) is greater than itself. Its abundance is 13892850456

Bases of 21391357812

• Binary: 10011111011000001100011011101110100₂
• Hexadecimal: 0x4FB063774
• Base-36: 9TRV1BO

Squares and roots of 21391357812

• 21391357812 squared (21391357812²) is 457590189041013427344
• 21391357812 cubed (21391357812³) is 9788475465037039367411968811328
• The square root of 21391357812 is 146257.8470099981
• The cube root of 21391357812 is 2775.9573165223

Scales and comparisons

• 21,391,357,812 seconds is equal to 680 years, 9 weeks, 2 days, 3 hours, 50 minutes, 12 seconds.
• To count from 1 to 21,391,357,812 would take you about one thousand, three hundred sixty 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 21391357812 cubic inches would be around 231.3 feet tall.

Recreational maths with 21391357812

• 21391357812 backwards is 21875319312
• The number of decimal digits it has is: 11
• The sum of 21391357812's digits is 42
• More coming soon!