21128646

Names of 21128646

• Cardinal: 21128646 can be written as Twenty-one million, one hundred twenty-eight thousand, six hundred forty-six.

Scientific notation

• Scientific notation: 2.1128646 × 10⁷

Factors of 21128646

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 154

Divisors of 21128646

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 6 7 11 14 19 21 22 29 33 38 42 57 58 66 77 83 87 114 133 154 166 174 203 209 231 249 266 319 399 406 418 462 498 551 581 609 627 638 798 913 957 1102 1162 1218 1254 1463 1577 1653 1743 1826 1914 2233 2407 2739 2926 3154 3306 3486 3857 4389 4466 4731 4814 5478 6061 6391 6699 7221 7714 8778 9462 11039 11571 12122 12782 13398 14442 16849 17347 18183 19173 22078 23142 26477 33117 33698 34694 36366 38346 42427 45733 50547 52041 52954 66234 79431 84854 91466 101094 104082 121429 127281 137199 158862 185339 242858 254562 274398 320131 364287 370678 503063 556017 640262 728574 960393 1006126 1112034 1509189 1920786 3018378 3521441 7042882 10564323 21128646
• Sum of all divisors σ(n): 58060800
• Sum of proper divisors (its aliquot sum) s(n): 36932154
• 21128646 is an abundant number, because the sum of its proper divisors (36932154) is greater than itself. Its abundance is 15803508

Bases of 21128646

• Binary: 1010000100110010111000110₂
• Hexadecimal: 0x14265C6
• Base-36: CKUYU

Squares and roots of 21128646

• 21128646 squared (21128646²) is 446419681793316
• 21128646 cubed (21128646³) is 9432243424043618930136
• The square root of 21128646 is 4596.5906931115
• The cube root of 21128646 is 276.4546434479

Scales and comparisons

• 21,128,646 seconds is equal to 34 weeks, 6 days, 13 hours, 4 minutes, 6 seconds.
• To count from 1 to 21,128,646 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 21128646 cubic inches would be around 23 feet tall.

Recreational maths with 21128646

• 21128646 backwards is 64682112
• The number of decimal digits it has is: 8
• The sum of 21128646's digits is 30
• More coming soon!