21007157990

Names of 21007157990

• Cardinal: 21007157990 can be written as Twenty-one billion, seven million, one hundred fifty-seven thousand, nine hundred ninety.

Scientific notation

• Scientific notation: 2.100715799 × 10¹⁰

Factors of 21007157990

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 253706

Divisors of 21007157990

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 5 7 10 13 14 26 35 49 65 70 91 98 130 169 182 245 338 455 490 637 845 910 1183 1274 1690 2366 3185 5915 6370 8281 11830 16562 41405 82810 253679 507358 1268395 1775753 2536790 3297827 3551506 6595654 8878765 12430271 16489135 17757530 23084789 24860542 32978270 42871751 46169578 62151355 85743502 115423945 124302710 161593523 214358755 230847890 300102257 323187046 428717510 600204514 807967615 1500511285 1615935230 2100715799 3001022570 4201431598 10503578995 21007157990
• Sum of all divisors σ(n): 47630449440
• Sum of proper divisors (its aliquot sum) s(n): 26623291450
• 21007157990 is an abundant number, because the sum of its proper divisors (26623291450) is greater than itself. Its abundance is 5616133460

Bases of 21007157990

• Binary: 10011100100000111111100101011100110₂
• Hexadecimal: 0x4E41FCAE6
• Base-36: 9NF4AUE

Squares and roots of 21007157990

• 21007157990 squared (21007157990²) is 441300686816820840100
• 21007157990 cubed (21007157990³) is 9270473249056465577505227399000
• The square root of 21007157990 is 144938.4627695493
• The cube root of 21007157990 is 2759.2376066717

Scales and comparisons

• 21,007,157,990 seconds is equal to 667 years, 50 weeks, 9 hours, 39 minutes, 50 seconds.
• To count from 1 to 21,007,157,990 would take you about one thousand, three hundred thirty-five 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 21007157990 cubic inches would be around 229.9 feet tall.

Recreational maths with 21007157990

• 21007157990 backwards is 09975170012
• The number of decimal digits it has is: 11
• The sum of 21007157990's digits is 41
• More coming soon!