21386742

Names of 21386742

• Cardinal: 21386742 can be written as Twenty-one million, three hundred eighty-six thousand, seven hundred forty-two.

Scientific notation

• Scientific notation: 2.1386742 × 10⁷

Factors of 21386742

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 14468

Divisors of 21386742

• Number of divisors d(n): 32
• Complete list of divisors:
  1 2 3 6 13 19 26 38 39 57 78 114 247 494 741 1482 14431 28862 43293 86586 187603 274189 375206 548378 562809 822567 1125618 1645134 3564457 7128914 10693371 21386742
• Sum of all divisors σ(n): 48491520
• Sum of proper divisors (its aliquot sum) s(n): 27104778
• 21386742 is an abundant number, because the sum of its proper divisors (27104778) is greater than itself. Its abundance is 5718036

Bases of 21386742

• Binary: 1010001100101010111110110₂
• Hexadecimal: 0x14655F6
• Base-36: CQE46

Squares and roots of 21386742

• 21386742 squared (21386742²) is 457392733374564
• 21386742 cubed (21386742³) is 9782140381356589630488
• The square root of 21386742 is 4624.5801971639
• The cube root of 21386742 is 277.5757637459

Scales and comparisons

• 21,386,742 seconds is equal to 35 weeks, 2 days, 12 hours, 45 minutes, 42 seconds.
• To count from 1 to 21,386,742 would take you about seven 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 21386742 cubic inches would be around 23.1 feet tall.

Recreational maths with 21386742

• 21386742 backwards is 24768312
• The number of decimal digits it has is: 8
• The sum of 21386742's digits is 33
• More coming soon!