21856

Names of 21856

• Cardinal: 21856 can be written as Twenty-one thousand, eight hundred fifty-six.

Scientific notation

• Scientific notation: 2.1856 × 10⁴

Factors of 21856

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 685

Divisors of 21856

• Number of divisors d(n): 12
• Complete list of divisors:
  1 2 4 8 16 32 683 1366 2732 5464 10928 21856
• Sum of all divisors σ(n): 43092
• Sum of proper divisors (its aliquot sum) s(n): 21236
• 21856 is a deficient number, because the sum of its proper divisors (21236) is less than itself. Its deficiency is 620

Bases of 21856

• Binary: 101010101100000₂
• Hexadecimal: 0x5560
• Base-36: GV4

Squares and roots of 21856

• 21856 squared (21856²) is 477684736
• 21856 cubed (21856³) is 10440277590016
• The square root of 21856 is 147.8377489007
• The cube root of 21856 is 27.9591240295

Scales and comparisons

• 21,856 seconds is equal to 6 hours, 4 minutes, 16 seconds.
• To count from 1 to 21,856 would take you about six 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 21856 cubic inches would be around 2.3 feet tall.

Recreational maths with 21856

• 21856 backwards is 65812
• The number of decimal digits it has is: 5
• The sum of 21856's digits is 22
• More coming soon!