21987442

Names of 21987442

• Cardinal: 21987442 can be written as Twenty-one million, nine hundred eighty-seven thousand, four hundred forty-two.

Scientific notation

• Scientific notation: 2.1987442 × 10⁷

Factors of 21987442

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 10993723

Divisors of 21987442

• Number of divisors d(n): 4
• Complete list of divisors:
  1 2 10993721 21987442
• Sum of all divisors σ(n): 32981166
• Sum of proper divisors (its aliquot sum) s(n): 10993724
• 21987442 is a deficient number, because the sum of its proper divisors (10993724) is less than itself. Its deficiency is 10993718

Bases of 21987442

• Binary: 1010011111000000001110010₂
• Hexadecimal: 0x14F8072
• Base-36: D39MA

Squares and roots of 21987442

• 21987442 squared (21987442²) is 483447605703364
• 21987442 cubed (21987442³) is 10629776190441585154888
• The square root of 21987442 is 4689.0768814341
• The cube root of 21987442 is 280.1506077513

Scales and comparisons

• 21,987,442 seconds is equal to 36 weeks, 2 days, 11 hours, 37 minutes, 22 seconds.
• To count from 1 to 21,987,442 would take you about two weeks!

  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 21987442 cubic inches would be around 23.3 feet tall.

Recreational maths with 21987442

• 21987442 backwards is 24478912
• The number of decimal digits it has is: 8
• The sum of 21987442's digits is 37
• More coming soon!