21345

Names of 21345

• Cardinal: 21345 can be written as Twenty-one thousand, three hundred forty-five.

Scientific notation

• Scientific notation: 2.1345 × 10⁴

Factors of 21345

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 1431

Divisors of 21345

• Number of divisors d(n): 8
• Complete list of divisors:
  1 3 5 15 1423 4269 7115 21345
• Sum of all divisors σ(n): 34176
• Sum of proper divisors (its aliquot sum) s(n): 12831
• 21345 is a deficient number, because the sum of its proper divisors (12831) is less than itself. Its deficiency is 8514

Bases of 21345

• Binary: 101001101100001₂
• Hexadecimal: 0x5361
• Base-36: GGX

Squares and roots of 21345

• 21345 squared (21345²) is 455609025
• 21345 cubed (21345³) is 9724974638625
• The square root of 21345 is 146.0992813125
• The cube root of 21345 is 27.7395058119

Scales and comparisons

• 21,345 seconds is equal to 5 hours, 55 minutes, 45 seconds.
• To count from 1 to 21,345 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 21345 cubic inches would be around 2.3 feet tall.

Recreational maths with 21345

• 21345 backwards is 54312
• 21345 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 21345's digits is 15
• More coming soon!