21249690

Names of 21249690

• Cardinal: 21249690 can be written as Twenty-one million, two hundred forty-nine thousand, six hundred ninety.

Scientific notation

• Scientific notation: 2.124969 × 10⁷

Factors of 21249690

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 9227

Divisors of 21249690

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 5 6 7 10 11 14 15 21 22 30 33 35 42 55 66 70 77 105 110 154 165 210 231 330 385 462 770 1155 2310 9199 18398 27597 45995 55194 64393 91990 101189 128786 137985 193179 202378 275970 303567 321965 386358 505945 607134 643930 708323 965895 1011890 1416646 1517835 1931790 2124969 3035670 3541615 4249938 7083230 10624845 21249690
• Sum of all divisors σ(n): 63590400
• Sum of proper divisors (its aliquot sum) s(n): 42340710
• 21249690 is an abundant number, because the sum of its proper divisors (42340710) is greater than itself. Its abundance is 21091020

Bases of 21249690

• Binary: 1010001000011111010011010₂
• Hexadecimal: 0x1443E9A
• Base-36: CNGD6

Squares and roots of 21249690

• 21249690 squared (21249690²) is 451549325096100
• 21249690 cubed (21249690³) is 9595283178001345209000
• The square root of 21249690 is 4609.7386043029
• The cube root of 21249690 is 276.9815659339

Scales and comparisons

• 21,249,690 seconds is equal to 35 weeks, 22 hours, 41 minutes, 30 seconds.
• To count from 1 to 21,249,690 would take you about four 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 21249690 cubic inches would be around 23.1 feet tall.

Recreational maths with 21249690

• 21249690 backwards is 09694212
• 21249690 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21249690's digits is 33
• More coming soon!