21123828

Names of 21123828

• Cardinal: 21123828 can be written as Twenty-one million, one hundred twenty-three thousand, eight hundred twenty-eight.

Scientific notation

• Scientific notation: 2.1123828 × 10⁷

Factors of 21123828

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 5943

Divisors of 21123828

• Number of divisors d(n): 60
• Complete list of divisors:
  1 2 3 4 6 9 11 12 18 22 27 33 36 44 54 66 81 99 108 132 162 198 297 324 396 594 891 1188 1782 3564 5927 11854 17781 23708 35562 53343 65197 71124 106686 130394 160029 195591 213372 260788 320058 391182 480087 586773 640116 782364 960174 1173546 1760319 1920348 2347092 3520638 5280957 7041276 10561914 21123828
• Sum of all divisors σ(n): 60252192
• Sum of proper divisors (its aliquot sum) s(n): 39128364
• 21123828 is an abundant number, because the sum of its proper divisors (39128364) is greater than itself. Its abundance is 18004536

Bases of 21123828

• Binary: 1010000100101001011110100₂
• Hexadecimal: 0x14252F4
• Base-36: CKR90

Squares and roots of 21123828

• 21123828 squared (21123828²) is 446216109373584
• 21123828 cubed (21123828³) is 9425792345236776159552
• The square root of 21123828 is 4596.0665791523
• The cube root of 21123828 is 276.4336283811

Scales and comparisons

• 21,123,828 seconds is equal to 34 weeks, 6 days, 11 hours, 43 minutes, 48 seconds.
• To count from 1 to 21,123,828 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 21123828 cubic inches would be around 23 feet tall.

Recreational maths with 21123828

• 21123828 backwards is 82832112
• 21123828 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21123828's digits is 27
• More coming soon!