21581728740

Names of 21581728740

• Cardinal: 21581728740 can be written as Twenty-one billion, five hundred eighty-one million, seven hundred twenty-eight thousand, seven hundred forty.

Scientific notation

• Scientific notation: 2.158172874 × 10¹⁰

Factors of 21581728740

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 44182

Divisors of 21581728740

• Number of divisors d(n): 288
• Complete list of divisors:
  1 2 3 4 5 6 9 10 11 12 13 15 18 19 20 22 26 30 33 36 38 39 44 45 52 55 57 60 65 66 76 78 90 95 99 110 114 117 130 132 143 156 165 171 180 190 195 198 209 220 228 234 247 260 285 286 330 342 380 390 396 418 429 468 494 495 570 572 585 627 660 684 715 741 780 836 855 858 988 990 1045 1140 1170 1235 1254 1287 1430 1482 1710 1716 1881 1980 2090 2145 2223 2340 2470 2508 2574 2717 2860 2964 3135 3420 3705 3762 4180 4290 4446 4940 5148 5434 6270 6435 7410 7524 8151 8580 8892 9405 10868 11115 12540 12870 13585 14820 16302 18810 22230 24453 25740 27170 32604 37620 40755 44129 44460 48906 54340 81510 88258 97812 122265 132387 163020 176516 220645 244530 264774 397161 441290 485419 489060 529548 573677 661935 794322 838451 882580 970838 1147354 1323870 1456257 1588644 1676902 1721031 1941676 1985805 2294708 2427095 2515353 2647740 2868385 2912514 3353804 3442062 3971610 4192255 4368771 4854190 5030706 5163093 5736770 5825028 6310447 6884124 7281285 7546059 7943220 8384510 8605155 8737542 9222961 9708380 10061412 10326186 10899863 11473540 12576765 12620894 14562570 15092118 16769020 17210310 17475084 18445922 18931341 20652372 21799726 21843855 25153530 25241788 25815465 27668883 29125140 30184236 31552235 32699589 34420620 36891844 37730295 37862682 43599452 43687710 46114805 50307060 51630930 54499315 55337766 56794023 63104470 65399178 75460590 75725364 83006649 87375420 92229610 94656705 98098767 103261860 108998630 110675532 113588046 119898493 126208940 130798356 138344415 150921180 163497945 166013298 184459220 189313410 196197534 217997260 227176092 239796986 276688830 283970115 326995890 332026596 359695479 378626820 392395068 415033245 479593972 490493835 553377660 567940230 599492465 653991780 719390958 830066490 980987670 1079086437 1135880460 1198984930 1438781916 1660132980 1798477395 1961975340 2158172874 2397969860 3596954790 4316345748 5395432185 7193909580 10790864370 21581728740
• Sum of all divisors σ(n): 80959132800
• Sum of proper divisors (its aliquot sum) s(n): 59377404060
• 21581728740 is an abundant number, because the sum of its proper divisors (59377404060) is greater than itself. Its abundance is 37795675320

Bases of 21581728740

• Binary: 10100000110010111110000101111100100₂
• Hexadecimal: 0x5065F0BE4
• Base-36: 9WX7CH0

Squares and roots of 21581728740

• 21581728740 squared (21581728740²) is 465771015406941987600
• 21581728740 cubed (21581728740³) is 10052143709466982689299643624000
• The square root of 21581728740 is 146907.2113274227
• The cube root of 21581728740 is 2784.1678223867

Scales and comparisons

• 21,581,728,740 seconds is equal to 686 years, 12 weeks, 12 hours, 39 minutes.
• To count from 1 to 21,581,728,740 would take you about one thousand, three hundred seventy-two years!

  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 21581728740 cubic inches would be around 232 feet tall.

Recreational maths with 21581728740

• 21581728740 backwards is 04782718512
• 21581728740 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21581728740's digits is 45
• More coming soon!