21007872

Names of 21007872

• Cardinal: 21007872 can be written as Twenty-one million, seven thousand, eight hundred seventy-two.

Scientific notation

• Scientific notation: 2.1007872 × 10⁷

Factors of 21007872

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 149

Divisors of 21007872

• Number of divisors d(n): 120
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 32 36 47 48 64 72 94 96 97 128 141 144 188 192 194 256 282 288 291 376 384 388 423 512 564 576 582 752 768 776 846 873 1128 1152 1164 1504 1536 1552 1692 1746 2256 2304 2328 3008 3104 3384 3492 4512 4559 4608 4656 6016 6208 6768 6984 9024 9118 9312 12032 12416 13536 13677 13968 18048 18236 18624 24064 24832 27072 27354 27936 36096 36472 37248 41031 49664 54144 54708 55872 72192 72944 74496 82062 108288 109416 111744 145888 148992 164124 216576 218832 223488 291776 328248 437664 446976 583552 656496 875328 1167104 1312992 1750656 2334208 2625984 3501312 5251968 7002624 10503936 21007872
• Sum of all divisors σ(n): 62558496
• Sum of proper divisors (its aliquot sum) s(n): 41550624
• 21007872 is an abundant number, because the sum of its proper divisors (41550624) is greater than itself. Its abundance is 20542752

Bases of 21007872

• Binary: 1010000001000111000000000₂
• Hexadecimal: 0x1408E00
• Base-36: CI9S0

Squares and roots of 21007872

• 21007872 squared (21007872²) is 441330685968384
• 21007872 cubed (21007872³) is 9271418560496007118848
• The square root of 21007872 is 4583.4345200951
• The cube root of 21007872 is 275.9268867459

Scales and comparisons

• 21,007,872 seconds is equal to 34 weeks, 5 days, 3 hours, 31 minutes, 12 seconds.
• To count from 1 to 21,007,872 would take you about seventeen 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 21007872 cubic inches would be around 23 feet tall.

Recreational maths with 21007872

• 21007872 backwards is 27870012
• The number of decimal digits it has is: 8
• The sum of 21007872's digits is 27
• More coming soon!