21400

Names of 21400

• Cardinal: 21400 can be written as Twenty-one thousand, four hundred.

Scientific notation

• Scientific notation: 2.14 × 10⁴

Factors of 21400

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 114

Divisors of 21400

• Number of divisors d(n): 24
• Complete list of divisors:
  1 2 4 5 8 10 20 25 40 50 100 107 200 214 428 535 856 1070 2140 2675 4280 5350 10700 21400
• Sum of all divisors σ(n): 50220
• Sum of proper divisors (its aliquot sum) s(n): 28820
• 21400 is an abundant number, because the sum of its proper divisors (28820) is greater than itself. Its abundance is 7420

Bases of 21400

• Binary: 101001110011000₂
• Hexadecimal: 0x5398
• Base-36: GIG

Squares and roots of 21400

• 21400 squared (21400²) is 457960000
• 21400 cubed (21400³) is 9800344000000
• The square root of 21400 is 146.2873883833
• The cube root of 21400 is 27.7633109855

Scales and comparisons

• 21,400 seconds is equal to 5 hours, 56 minutes, 40 seconds.
• To count from 1 to 21,400 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 21400 cubic inches would be around 2.3 feet tall.

Recreational maths with 21400

• 21400 backwards is 00412
• The number of decimal digits it has is: 5
• The sum of 21400's digits is 7
• More coming soon!