21128918

Names of 21128918

• Cardinal: 21128918 can be written as Twenty-one million, one hundred twenty-eight thousand, nine hundred eighteen.

Scientific notation

• Scientific notation: 2.1128918 × 10⁷

Factors of 21128918

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 340822

Divisors of 21128918

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 31 62 340789 681578 10564459 21128918
• Sum of all divisors σ(n): 32715840
• Sum of proper divisors (its aliquot sum) s(n): 11586922
• 21128918 is a deficient number, because the sum of its proper divisors (11586922) is less than itself. Its deficiency is 9541996

Bases of 21128918

• Binary: 1010000100110011011010110₂
• Hexadecimal: 0x14266D6
• Base-36: CKV6E

Squares and roots of 21128918

• 21128918 squared (21128918²) is 446431175850724
• 21128918 cubed (21128918³) is 9432607707193527636632
• The square root of 21128918 is 4596.6202801623
• The cube root of 21128918 is 276.4558297575

Scales and comparisons

• 21,128,918 seconds is equal to 34 weeks, 6 days, 13 hours, 8 minutes, 38 seconds.
• To count from 1 to 21,128,918 would take you about two days!

  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 21128918 cubic inches would be around 23 feet tall.

Recreational maths with 21128918

• 21128918 backwards is 81982112
• The number of decimal digits it has is: 8
• The sum of 21128918's digits is 32
• More coming soon!