21440991

Names of 21440991

• Cardinal: 21440991 can be written as Twenty-one million, four hundred forty thousand, nine hundred ninety-one.

Scientific notation

• Scientific notation: 2.1440991 × 10⁷

Factors of 21440991

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 144

Divisors of 21440991

• Number of divisors d(n): 64
• Complete list of divisors:
  1 3 11 13 23 33 39 41 53 69 123 143 159 253 299 429 451 533 583 689 759 897 943 1219 1353 1599 1749 2067 2173 2829 3289 3657 5863 6519 7579 9867 10373 12259 13409 15847 17589 22737 23903 28249 31119 36777 40227 47541 49979 71709 84747 134849 149937 174317 310739 404547 522951 549769 649727 932217 1649307 1949181 7146997 21440991
• Sum of all divisors σ(n): 36578304
• Sum of proper divisors (its aliquot sum) s(n): 15137313
• 21440991 is a deficient number, because the sum of its proper divisors (15137313) is less than itself. Its deficiency is 6303678

Bases of 21440991

• Binary: 1010001110010100111011111₂
• Hexadecimal: 0x14729DF
• Base-36: CRJZ3

Squares and roots of 21440991

• 21440991 squared (21440991²) is 459716095062081
• 21440991 cubed (21440991³) is 9856768656781223162271
• The square root of 21440991 is 4630.4417715807
• The cube root of 21440991 is 277.8102625061

Scales and comparisons

• 21,440,991 seconds is equal to 35 weeks, 3 days, 3 hours, 49 minutes, 51 seconds.
• To count from 1 to 21,440,991 would take you about five 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 21440991 cubic inches would be around 23.2 feet tall.

Recreational maths with 21440991

• 21440991 backwards is 19904412
• The number of decimal digits it has is: 8
• The sum of 21440991's digits is 30
• More coming soon!