21957

Names of 21957

• Cardinal: 21957 can be written as Twenty-one thousand, nine hundred fifty-seven.

Scientific notation

• Scientific notation: 2.1957 × 10⁴

Factors of 21957

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 579

Divisors of 21957

• Number of divisors d(n): 8
• Complete list of divisors:
  1 3 13 39 563 1689 7319 21957
• Sum of all divisors σ(n): 31584
• Sum of proper divisors (its aliquot sum) s(n): 9627
• 21957 is a deficient number, because the sum of its proper divisors (9627) is less than itself. Its deficiency is 12330

Bases of 21957

• Binary: 101010111000101₂
• Hexadecimal: 0x55C5
• Base-36: GXX

Squares and roots of 21957

• 21957 squared (21957²) is 482109849
• 21957 cubed (21957³) is 10585685954493
• The square root of 21957 is 148.1789458729
• The cube root of 21957 is 28.0021256889

Scales and comparisons

• 21,957 seconds is equal to 6 hours, 5 minutes, 57 seconds.
• To count from 1 to 21,957 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 21957 cubic inches would be around 2.3 feet tall.

Recreational maths with 21957

• 21957 backwards is 75912
• The number of decimal digits it has is: 5
• The sum of 21957's digits is 24
• More coming soon!