21315840

Names of 21315840

• Cardinal: 21315840 can be written as Twenty-one million, three hundred fifteen thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.131584 × 10⁷

Factors of 21315840

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 91

Divisors of 21315840

• Number of divisors d(n): 288
• Complete list of divisors:
  1 2 3 4 5 6 7 8 10 12 13 14 15 16 20 21 24 26 28 30 32 35 39 40 42 48 52 56 60 61 64 65 70 78 80 84 91 96 104 105 112 120 122 128 130 140 156 160 168 182 183 192 195 208 210 224 240 244 256 260 273 280 305 312 320 336 364 366 384 390 416 420 427 448 455 480 488 520 546 560 610 624 640 672 728 732 768 780 793 832 840 854 896 910 915 960 976 1040 1092 1120 1220 1248 1280 1281 1344 1365 1456 1464 1560 1586 1664 1680 1708 1792 1820 1830 1920 1952 2080 2135 2184 2240 2379 2440 2496 2562 2688 2730 2912 2928 3120 3172 3328 3360 3416 3640 3660 3840 3904 3965 4160 4270 4368 4480 4758 4880 4992 5124 5376 5460 5551 5824 5856 6240 6344 6405 6720 6832 7280 7320 7808 7930 8320 8540 8736 8960 9516 9760 9984 10248 10920 11102 11648 11712 11895 12480 12688 12810 13440 13664 14560 14640 15616 15860 16640 16653 17080 17472 19032 19520 20496 21840 22204 23296 23424 23790 24960 25376 25620 26880 27328 27755 29120 29280 31720 33306 34160 34944 38064 39040 40992 43680 44408 46848 47580 49920 50752 51240 54656 55510 58240 58560 63440 66612 68320 69888 76128 78080 81984 83265 87360 88816 95160 101504 102480 109312 111020 116480 117120 126880 133224 136640 152256 163968 166530 174720 177632 190320 203008 204960 222040 234240 253760 266448 273280 304512 327936 333060 349440 355264 380640 409920 444080 507520 532896 546560 609024 666120 710528 761280 819840 888160 1015040 1065792 1332240 1421056 1522560 1639680 1776320 2131584 2664480 3045120 3552640 4263168 5328960 7105280 10657920 21315840
• Sum of all divisors σ(n): 85161216
• Sum of proper divisors (its aliquot sum) s(n): 63845376
• 21315840 is an abundant number, because the sum of its proper divisors (63845376) is greater than itself. Its abundance is 42529536

Bases of 21315840

• Binary: 1010001010100000100000000₂
• Hexadecimal: 0x1454100
• Base-36: COVEO

Squares and roots of 21315840

• 21315840 squared (21315840²) is 454365034905600
• 21315840 cubed (21315840³) is 9685172385642184704000
• The square root of 21315840 is 4616.9080562645
• The cube root of 21315840 is 277.2686815107

Scales and comparisons

• 21,315,840 seconds is equal to 35 weeks, 1 day, 17 hours, 4 minutes.
• To count from 1 to 21,315,840 would take you about six 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 21315840 cubic inches would be around 23.1 feet tall.

Recreational maths with 21315840

• 21315840 backwards is 04851312
• 21315840 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21315840's digits is 24
• More coming soon!