21007

Names of 21007

• Cardinal: 21007 can be written as Twenty-one thousand and seven.

Scientific notation

• Scientific notation: 2.1007 × 10⁴

Factors of 21007

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 3008

Divisors of 21007

• Number of divisors d(n): 4
• Complete list of divisors:
  1 7 3001 21007
• Sum of all divisors σ(n): 24016
• Sum of proper divisors (its aliquot sum) s(n): 3009
• 21007 is a deficient number, because the sum of its proper divisors (3009) is less than itself. Its deficiency is 17998

Bases of 21007

• Binary: 101001000001111₂
• Hexadecimal: 0x520F
• Base-36: G7J

Squares and roots of 21007

• 21007 squared (21007²) is 441294049
• 21007 cubed (21007³) is 9270264087343
• The square root of 21007 is 144.9379177441
• The cube root of 21007 is 27.5923068945

Scales and comparisons

• 21,007 seconds is equal to 5 hours, 50 minutes, 7 seconds.
• To count from 1 to 21,007 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 21007 cubic inches would be around 2.3 feet tall.

Recreational maths with 21007

• 21007 backwards is 70012
• The number of decimal digits it has is: 5
• The sum of 21007's digits is 10
• More coming soon!