21457

Names of 21457

• Cardinal: 21457 can be written as Twenty-one thousand, four hundred fifty-seven.

Scientific notation

• Scientific notation: 2.1457 × 10⁴

Factors of 21457

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 542

Divisors of 21457

• Number of divisors d(n): 4
• Complete list of divisors:
  1 43 499 21457
• Sum of all divisors σ(n): 22000
• Sum of proper divisors (its aliquot sum) s(n): 543
• 21457 is a deficient number, because the sum of its proper divisors (543) is less than itself. Its deficiency is 20914

Bases of 21457

• Binary: 101001111010001₂
• Hexadecimal: 0x53D1
• Base-36: GK1

Squares and roots of 21457

• 21457 squared (21457²) is 460402849
• 21457 cubed (21457³) is 9878863930993
• The square root of 21457 is 146.4820808153
• The cube root of 21457 is 27.7879388011

Scales and comparisons

• 21,457 seconds is equal to 5 hours, 57 minutes, 37 seconds.
• To count from 1 to 21,457 would take you about five 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 21457 cubic inches would be around 2.3 feet tall.

Recreational maths with 21457

• 21457 backwards is 75412
• The number of decimal digits it has is: 5
• The sum of 21457's digits is 19
• More coming soon!