21928

Names of 21928

• Cardinal: 21928 can be written as Twenty-one thousand, nine hundred twenty-eight.

Scientific notation

• Scientific notation: 2.1928 × 10⁴

Factors of 21928

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 2743

Divisors of 21928

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 4 8 2741 5482 10964 21928
• Sum of all divisors σ(n): 41130
• Sum of proper divisors (its aliquot sum) s(n): 19202
• 21928 is a deficient number, because the sum of its proper divisors (19202) is less than itself. Its deficiency is 2726

Bases of 21928

• Binary: 101010110101000₂
• Hexadecimal: 0x55A8
• Base-36: GX4

Squares and roots of 21928

• 21928 squared (21928²) is 480837184
• 21928 cubed (21928³) is 10543797770752
• The square root of 21928 is 148.0810588833
• The cube root of 21928 is 27.9897921975

Scales and comparisons

• 21,928 seconds is equal to 6 hours, 5 minutes, 28 seconds.
• To count from 1 to 21,928 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 21928 cubic inches would be around 2.3 feet tall.

Recreational maths with 21928

• 21928 backwards is 82912
• The number of decimal digits it has is: 5
• The sum of 21928's digits is 22
• More coming soon!