21800

Names of 21800

• Cardinal: 21800 can be written as Twenty-one thousand, eight hundred.

Scientific notation

• Scientific notation: 2.18 × 10⁴

Factors of 21800

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 116

Divisors of 21800

• Number of divisors d(n): 24
• Complete list of divisors:
  1 2 4 5 8 10 20 25 40 50 100 109 200 218 436 545 872 1090 2180 2725 4360 5450 10900 21800
• Sum of all divisors σ(n): 51150
• Sum of proper divisors (its aliquot sum) s(n): 29350
• 21800 is an abundant number, because the sum of its proper divisors (29350) is greater than itself. Its abundance is 7550

Bases of 21800

• Binary: 101010100101000₂
• Hexadecimal: 0x5528
• Base-36: GTK

Squares and roots of 21800

• 21800 squared (21800²) is 475240000
• 21800 cubed (21800³) is 10360232000000
• The square root of 21800 is 147.6482306023
• The cube root of 21800 is 27.9352244125

Scales and comparisons

• 21,800 seconds is equal to 6 hours, 3 minutes, 20 seconds.
• To count from 1 to 21,800 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 21800 cubic inches would be around 2.3 feet tall.

Recreational maths with 21800

• 21800 backwards is 00812
• The number of decimal digits it has is: 5
• The sum of 21800's digits is 11
• More coming soon!