21105040

Names of 21105040

• Cardinal: 21105040 can be written as Twenty-one million, one hundred five thousand and forty.

Scientific notation

• Scientific notation: 2.110504 × 10⁷

Factors of 21105040

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 874

Divisors of 21105040

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 4 5 8 10 11 16 20 22 29 40 44 55 58 80 88 110 116 145 176 220 232 290 319 440 464 580 638 827 880 1160 1276 1595 1654 2320 2552 3190 3308 4135 5104 6380 6616 8270 9097 12760 13232 16540 18194 23983 25520 33080 36388 45485 47966 66160 72776 90970 95932 119915 145552 181940 191864 239830 263813 363880 383728 479660 527626 727760 959320 1055252 1319065 1918640 2110504 2638130 4221008 5276260 10552520 21105040
• Sum of all divisors σ(n): 55442880
• Sum of proper divisors (its aliquot sum) s(n): 34337840
• 21105040 is an abundant number, because the sum of its proper divisors (34337840) is greater than itself. Its abundance is 13232800

Bases of 21105040

• Binary: 1010000100000100110010000₂
• Hexadecimal: 0x1420990
• Base-36: CKCR4

Squares and roots of 21105040

• 21105040 squared (21105040²) is 445422713401600
• 21105040 cubed (21105040³) is 9400664183249304064000
• The square root of 21105040 is 4594.0222028199
• The cube root of 21105040 is 276.3516486763

Scales and comparisons

• 21,105,040 seconds is equal to 34 weeks, 6 days, 6 hours, 30 minutes, 40 seconds.
• To count from 1 to 21,105,040 would take you about two days!

  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 21105040 cubic inches would be around 23 feet tall.

Recreational maths with 21105040

• 21105040 backwards is 04050112
• The number of decimal digits it has is: 8
• The sum of 21105040's digits is 13
• More coming soon!