21285966

Names of 21285966

• Cardinal: 21285966 can be written as Twenty-one million, two hundred eighty-five thousand, nine hundred sixty-six.

Scientific notation

• Scientific notation: 2.1285966 × 10⁷

Factors of 21285966

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 361

Divisors of 21285966

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 6 13 19 26 38 39 53 57 78 106 114 159 247 271 318 494 542 689 741 813 1007 1378 1482 1626 2014 2067 3021 3523 4134 5149 6042 7046 10298 10569 13091 14363 15447 21138 26182 28726 30894 39273 43089 66937 78546 86178 133874 186719 200811 272897 373438 401622 545794 560157 818691 1120314 1637382 3547661 7095322 10642983 21285966
• Sum of all divisors σ(n): 49351680
• Sum of proper divisors (its aliquot sum) s(n): 28065714
• 21285966 is an abundant number, because the sum of its proper divisors (28065714) is greater than itself. Its abundance is 6779748

Bases of 21285966

• Binary: 1010001001100110001001110₂
• Hexadecimal: 0x144CC4E
• Base-36: CO8CU

Squares and roots of 21285966

• 21285966 squared (21285966²) is 453092348553156
• 21285966 cubed (21285966³) is 9644508326162627808696
• The square root of 21285966 is 4613.6716398113
• The cube root of 21285966 is 277.1390909155

Scales and comparisons

• 21,285,966 seconds is equal to 35 weeks, 1 day, 8 hours, 46 minutes, 6 seconds.
• To count from 1 to 21,285,966 would take you about five 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 21285966 cubic inches would be around 23.1 feet tall.

Recreational maths with 21285966

• 21285966 backwards is 66958212
• 21285966 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21285966's digits is 39
• More coming soon!