21845209

Names of 21845209

• Cardinal: 21845209 can be written as Twenty-one million, eight hundred forty-five thousand, two hundred nine.

Scientific notation

• Scientific notation: 2.1845209 × 10⁷

Factors of 21845209

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 1367

Divisors of 21845209

• Number of divisors d(n): 8
• Complete list of divisors:
  1 71 313 983 22223 69793 307679 21845209
• Sum of all divisors σ(n): 22246272
• Sum of proper divisors (its aliquot sum) s(n): 401063
• 21845209 is a deficient number, because the sum of its proper divisors (401063) is less than itself. Its deficiency is 21444146

Bases of 21845209

• Binary: 1010011010101010011011001₂
• Hexadecimal: 0x14D54D9
• Base-36: D07VD

Squares and roots of 21845209

• 21845209 squared (21845209²) is 477213156253681
• 21845209 cubed (21845209³) is 10424821135911318464329
• The square root of 21845209 is 4673.8858565437
• The cube root of 21845209 is 279.5452183669

Scales and comparisons

• 21,845,209 seconds is equal to 36 weeks, 20 hours, 6 minutes, 49 seconds.
• To count from 1 to 21,845,209 would take you about two weeks!

  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 21845209 cubic inches would be around 23.3 feet tall.

Recreational maths with 21845209

• 21845209 backwards is 90254812
• The number of decimal digits it has is: 8
• The sum of 21845209's digits is 31
• More coming soon!