21087987440

Names of 21087987440

• Cardinal: 21087987440 can be written as Twenty-one billion, eighty-seven million, nine hundred eighty-seven thousand, four hundred forty.

Scientific notation

• Scientific notation: 2.108798744 × 10¹⁰

Factors of 21087987440

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 20276931

Divisors of 21087987440

• Number of divisors d(n): 40
• Complete list of divisors:
  1 2 4 5 8 10 13 16 20 26 40 52 65 80 104 130 208 260 520 1040 20276911 40553822 81107644 101384555 162215288 202769110 263599843 324430576 405538220 527199686 811076440 1054399372 1317999215 1622152880 2108798744 2635998430 4217597488 5271996860 10543993720 21087987440
• Sum of all divisors σ(n): 52801078848
• Sum of proper divisors (its aliquot sum) s(n): 31713091408
• 21087987440 is an abundant number, because the sum of its proper divisors (31713091408) is greater than itself. Its abundance is 10625103968

Bases of 21087987440

• Binary: 10011101000111100010010011011110000₂
• Hexadecimal: 0x4E8F126F0
• Base-36: 9OR8R8W

Squares and roots of 21087987440

• 21087987440 squared (21087987440²) is 444703214269597753600
• 21087987440 cubed (21087987440³) is 9377895797044906201769014784000
• The square root of 21087987440 is 145217.0356397621
• The cube root of 21087987440 is 2762.7719927381

Scales and comparisons

• 21,087,987,440 seconds is equal to 670 years, 27 weeks, 4 days, 22 hours, 17 minutes, 20 seconds.
• To count from 1 to 21,087,987,440 would take you about one thousand, three hundred forty-one 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 21087987440 cubic inches would be around 230.2 feet tall.

Recreational maths with 21087987440

• 21087987440 backwards is 04478978012
• The number of decimal digits it has is: 11
• The sum of 21087987440's digits is 50
• More coming soon!