21545

Names of 21545

• Cardinal: 21545 can be written as Twenty-one thousand, five hundred forty-five.

Scientific notation

• Scientific notation: 2.1545 × 10⁴

Factors of 21545

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 175

Divisors of 21545

• Number of divisors d(n): 8
• Complete list of divisors:
  1 5 31 139 155 695 4309 21545
• Sum of all divisors σ(n): 26880
• Sum of proper divisors (its aliquot sum) s(n): 5335
• 21545 is a deficient number, because the sum of its proper divisors (5335) is less than itself. Its deficiency is 16210

Bases of 21545

• Binary: 101010000101001₂
• Hexadecimal: 0x5429
• Base-36: GMH

Squares and roots of 21545

• 21545 squared (21545²) is 464187025
• 21545 cubed (21545³) is 10000909453625
• The square root of 21545 is 146.7821515037
• The cube root of 21545 is 27.8258751895

Scales and comparisons

• 21,545 seconds is equal to 5 hours, 59 minutes, 5 seconds.
• To count from 1 to 21,545 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 21545 cubic inches would be around 2.3 feet tall.

Recreational maths with 21545

• 21545 backwards is 54512
• The number of decimal digits it has is: 5
• The sum of 21545's digits is 17
• More coming soon!