21009931

Names of 21009931

• Cardinal: 21009931 can be written as Twenty-one million, nine thousand, nine hundred thirty-one.

Scientific notation

• Scientific notation: 2.1009931 × 10⁷

Factors of 21009931

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 21009931

Divisors of 21009931

• Number of divisors d(n): 2
• Complete list of divisors:
  1 21009931
• Sum of all divisors σ(n): 21009932
• Sum of proper divisors (its aliquot sum) s(n): 1
• 21009931 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 21009930

Bases of 21009931

• Binary: 1010000001001011000001011₂
• Hexadecimal: 0x140960B
• Base-36: CIBD7

Squares and roots of 21009931

• 21009931 squared (21009931²) is 441417200624761
• 21009931 cubed (21009931³) is 9274144927339385501491
• The square root of 21009931 is 4583.6591278149
• The cube root of 21009931 is 275.9359010637

Scales and comparisons

• 21,009,931 seconds is equal to 34 weeks, 5 days, 4 hours, 5 minutes, 31 seconds.
• To count from 1 to 21,009,931 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 21009931 cubic inches would be around 23 feet tall.

Recreational maths with 21009931

• 21009931 backwards is 13990012
• The number of decimal digits it has is: 8
• The sum of 21009931's digits is 25
• More coming soon!