21019900

Names of 21019900

• Cardinal: 21019900 can be written as Twenty-one million, nineteen thousand, nine hundred.

Scientific notation

• Scientific notation: 2.10199 × 10⁷

Factors of 21019900

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 312

Divisors of 21019900

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 4 5 10 11 20 22 25 44 50 55 97 100 110 194 197 220 275 388 394 485 550 788 970 985 1067 1100 1940 1970 2134 2167 2425 3940 4268 4334 4850 4925 5335 8668 9700 9850 10670 10835 19109 19700 21340 21670 26675 38218 43340 53350 54175 76436 95545 106700 108350 191090 210199 216700 382180 420398 477725 840796 955450 1050995 1910900 2101990 4203980 5254975 10509950 21019900
• Sum of all divisors σ(n): 50528016
• Sum of proper divisors (its aliquot sum) s(n): 29508116
• 21019900 is an abundant number, because the sum of its proper divisors (29508116) is greater than itself. Its abundance is 8488216

Bases of 21019900

• Binary: 1010000001011110011111100₂
• Hexadecimal: 0x140BCFC
• Base-36: CIJ24

Squares and roots of 21019900

• 21019900 squared (21019900²) is 441836196010000
• 21019900 cubed (21019900³) is 9287352656510599000000
• The square root of 21019900 is 4584.7464488235
• The cube root of 21019900 is 275.9795370953

Scales and comparisons

• 21,019,900 seconds is equal to 34 weeks, 5 days, 6 hours, 51 minutes, 40 seconds.
• To count from 1 to 21,019,900 would take you about twenty-two hours!

  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 21019900 cubic inches would be around 23 feet tall.

Recreational maths with 21019900

• 21019900 backwards is 00991012
• 21019900 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21019900's digits is 22
• More coming soon!