21010809

Names of 21010809

• Cardinal: 21010809 can be written as Twenty-one million, ten thousand, eight hundred nine.

Scientific notation

• Scientific notation: 2.1010809 × 10⁷

Factors of 21010809

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 7003606

Divisors of 21010809

• Number of divisors d(n): 4
• Complete list of divisors:
  1 3 7003603 21010809
• Sum of all divisors σ(n): 28014416
• Sum of proper divisors (its aliquot sum) s(n): 7003607
• 21010809 is a deficient number, because the sum of its proper divisors (7003607) is less than itself. Its deficiency is 14007202

Bases of 21010809

• Binary: 1010000001001100101111001₂
• Hexadecimal: 0x1409979
• Base-36: CIC1L

Squares and roots of 21010809

• 21010809 squared (21010809²) is 441454094834481
• 21010809 cubed (21010809³) is 9275307668835166905129
• The square root of 21010809 is 4583.7549018243
• The cube root of 21010809 is 275.9397447753

Scales and comparisons

• 21,010,809 seconds is equal to 34 weeks, 5 days, 4 hours, 20 minutes, 9 seconds.
• To count from 1 to 21,010,809 would take you about eighteen 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 21010809 cubic inches would be around 23 feet tall.

Recreational maths with 21010809

• 21010809 backwards is 90801012
• The number of decimal digits it has is: 8
• The sum of 21010809's digits is 21
• More coming soon!