21389631

Names of 21389631

• Cardinal: 21389631 can be written as Twenty-one million, three hundred eighty-nine thousand, six hundred thirty-one.

Scientific notation

• Scientific notation: 2.1389631 × 10⁷

Factors of 21389631

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 7129880

Divisors of 21389631

• Number of divisors d(n): 4
• Complete list of divisors:
  1 3 7129877 21389631
• Sum of all divisors σ(n): 28519512
• Sum of proper divisors (its aliquot sum) s(n): 7129881
• 21389631 is a deficient number, because the sum of its proper divisors (7129881) is less than itself. Its deficiency is 14259750

Bases of 21389631

• Binary: 1010001100110000100111111₂
• Hexadecimal: 0x146613F
• Base-36: CQGCF

Squares and roots of 21389631

• 21389631 squared (21389631²) is 457516314316161
• 21389631 cubed (21389631³) is 9786105139702701126591
• The square root of 21389631 is 4624.8925392919
• The cube root of 21389631 is 277.5882618359

Scales and comparisons

• 21,389,631 seconds is equal to 35 weeks, 2 days, 13 hours, 33 minutes, 51 seconds.
• To count from 1 to 21,389,631 would take you about eight 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 21389631 cubic inches would be around 23.1 feet tall.

Recreational maths with 21389631

• 21389631 backwards is 13698312
• The number of decimal digits it has is: 8
• The sum of 21389631's digits is 33
• More coming soon!