21247

Names of 21247

• Cardinal: 21247 can be written as Twenty-one thousand, two hundred forty-seven.

Scientific notation

• Scientific notation: 2.1247 × 10⁴

Factors of 21247

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 21247

Divisors of 21247

• Number of divisors d(n): 2
• Complete list of divisors:
  1 21247
• Sum of all divisors σ(n): 21248
• Sum of proper divisors (its aliquot sum) s(n): 1
• 21247 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 21246

Bases of 21247

• Binary: 101001011111111₂
• Hexadecimal: 0x52FF
• Base-36: GE7

Squares and roots of 21247

• 21247 squared (21247²) is 451435009
• 21247 cubed (21247³) is 9591639636223
• The square root of 21247 is 145.7635070929
• The cube root of 21247 is 27.6969877735

Scales and comparisons

• 21,247 seconds is equal to 5 hours, 54 minutes, 7 seconds.
• To count from 1 to 21,247 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 21247 cubic inches would be around 2.3 feet tall.

Recreational maths with 21247

• 21247 backwards is 74212
• The number of decimal digits it has is: 5
• The sum of 21247's digits is 16
• More coming soon!