21438542

Names of 21438542

• Cardinal: 21438542 can be written as Twenty-one million, four hundred thirty-eight thousand, five hundred forty-two.

Scientific notation

• Scientific notation: 2.1438542 × 10⁷

Factors of 21438542

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 24642

Divisors of 21438542

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 443 886 24197 48394 10719271 21438542
• Sum of all divisors σ(n): 32231736
• Sum of proper divisors (its aliquot sum) s(n): 10793194
• 21438542 is a deficient number, because the sum of its proper divisors (10793194) is less than itself. Its deficiency is 10645348

Bases of 21438542

• Binary: 1010001110010000001001110₂
• Hexadecimal: 0x147204E
• Base-36: CRI32

Squares and roots of 21438542

• 21438542 squared (21438542²) is 459611083085764
• 21438542 cubed (21438542³) is 9853391508399641116088
• The square root of 21438542 is 4630.1773184189
• The cube root of 21438542 is 277.7996848977

Scales and comparisons

• 21,438,542 seconds is equal to 35 weeks, 3 days, 3 hours, 9 minutes, 2 seconds.
• To count from 1 to 21,438,542 would take you about four 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 21438542 cubic inches would be around 23.1 feet tall.

Recreational maths with 21438542

• 21438542 backwards is 24583412
• The number of decimal digits it has is: 8
• The sum of 21438542's digits is 29
• More coming soon!