21009018

Names of 21009018

• Cardinal: 21009018 can be written as Twenty-one million, nine thousand and eighteen.

Scientific notation

• Scientific notation: 2.1009018 × 10⁷

Factors of 21009018

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 3501508

Divisors of 21009018

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 3 6 3501503 7003006 10504509 21009018
• Sum of all divisors σ(n): 42018048
• Sum of proper divisors (its aliquot sum) s(n): 21009030
• 21009018 is an abundant number, because the sum of its proper divisors (21009030) is greater than itself. Its abundance is 12

Bases of 21009018

• Binary: 1010000001001001001111010₂
• Hexadecimal: 0x140927A
• Base-36: CIANU

Squares and roots of 21009018

• 21009018 squared (21009018²) is 441378837324324
• 21009018 cubed (21009018³) is 9272935938165794753832
• The square root of 21009018 is 4583.5595338123
• The cube root of 21009018 is 275.9319040153

Scales and comparisons

• 21,009,018 seconds is equal to 34 weeks, 5 days, 3 hours, 50 minutes, 18 seconds.
• To count from 1 to 21,009,018 would take you about seventeen 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 21009018 cubic inches would be around 23 feet tall.

Recreational maths with 21009018

• 21009018 backwards is 81090012
• The number of decimal digits it has is: 8
• The sum of 21009018's digits is 21
• More coming soon!