21138156

Names of 21138156

• Cardinal: 21138156 can be written as Twenty-one million, one hundred thirty-eight thousand, one hundred fifty-six.

Scientific notation

• Scientific notation: 2.1138156 × 10⁷

Factors of 21138156

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 96

Divisors of 21138156

• Number of divisors d(n): 108
• Complete list of divisors:
  1 2 3 4 6 9 12 13 18 26 31 36 39 47 52 62 78 93 94 117 124 141 156 186 188 234 279 282 372 403 423 468 558 564 611 806 846 961 1116 1209 1222 1457 1612 1692 1833 1922 2418 2444 2883 2914 3627 3666 3844 4371 4836 5499 5766 5828 7254 7332 8649 8742 10998 11532 12493 13113 14508 17298 17484 18941 21996 24986 26226 34596 37479 37882 45167 49972 52452 56823 74958 75764 90334 112437 113646 135501 149916 170469 180668 224874 227292 271002 340938 406503 449748 542004 587171 681876 813006 1174342 1626012 1761513 2348684 3523026 5284539 7046052 10569078 21138156
• Sum of all divisors σ(n): 60723936
• Sum of proper divisors (its aliquot sum) s(n): 39585780
• 21138156 is an abundant number, because the sum of its proper divisors (39585780) is greater than itself. Its abundance is 18447624

Bases of 21138156

• Binary: 1010000101000101011101100₂
• Hexadecimal: 0x1428AEC
• Base-36: CL2B0

Squares and roots of 21138156

• 21138156 squared (21138156²) is 446821639080336
• 21138156 cubed (21138156³) is 9444985511055838900416
• The square root of 21138156 is 4597.6250390827
• The cube root of 21138156 is 276.4961146227

Scales and comparisons

• 21,138,156 seconds is equal to 34 weeks, 6 days, 15 hours, 42 minutes, 36 seconds.
• To count from 1 to 21,138,156 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 21138156 cubic inches would be around 23 feet tall.

Recreational maths with 21138156

• 21138156 backwards is 65183112
• The number of decimal digits it has is: 8
• The sum of 21138156's digits is 27
• More coming soon!