21724

Names of 21724

• Cardinal: 21724 can be written as Twenty-one thousand, seven hundred twenty-four.

Scientific notation

• Scientific notation: 2.1724 × 10⁴

Factors of 21724

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 5433

Divisors of 21724

• Number of divisors d(n): 6
• Complete list of divisors:
  1 2 4 5431 10862 21724
• Sum of all divisors σ(n): 38024
• Sum of proper divisors (its aliquot sum) s(n): 16300
• 21724 is a deficient number, because the sum of its proper divisors (16300) is less than itself. Its deficiency is 5424

Bases of 21724

• Binary: 101010011011100₂
• Hexadecimal: 0x54DC
• Base-36: GRG

Squares and roots of 21724

• 21724 squared (21724²) is 471932176
• 21724 cubed (21724³) is 10252254591424
• The square root of 21724 is 147.3906374231
• The cube root of 21724 is 27.9027236629

Scales and comparisons

• 21,724 seconds is equal to 6 hours, 2 minutes, 4 seconds.
• To count from 1 to 21,724 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 21724 cubic inches would be around 2.3 feet tall.

Recreational maths with 21724

• 21724 backwards is 42712
• The number of decimal digits it has is: 5
• The sum of 21724's digits is 16
• More coming soon!