21947

Names of 21947

• Cardinal: 21947 can be written as Twenty-one thousand, nine hundred forty-seven.

Scientific notation

• Scientific notation: 2.1947 × 10⁴

Factors of 21947

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1308

Divisors of 21947

• Number of divisors d(n): 4
• Complete list of divisors:
  1 17 1291 21947
• Sum of all divisors σ(n): 23256
• Sum of proper divisors (its aliquot sum) s(n): 1309
• 21947 is a deficient number, because the sum of its proper divisors (1309) is less than itself. Its deficiency is 20638

Bases of 21947

• Binary: 101010110111011₂
• Hexadecimal: 0x55BB
• Base-36: GXN

Squares and roots of 21947

• 21947 squared (21947²) is 481670809
• 21947 cubed (21947³) is 10571229245123
• The square root of 21947 is 148.1451990447
• The cube root of 21947 is 27.9978739883

Scales and comparisons

• 21,947 seconds is equal to 6 hours, 5 minutes, 47 seconds.
• To count from 1 to 21,947 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 21947 cubic inches would be around 2.3 feet tall.

Recreational maths with 21947

• 21947 backwards is 74912
• The number of decimal digits it has is: 5
• The sum of 21947's digits is 23
• More coming soon!