21285187440

Names of 21285187440

• Cardinal: 21285187440 can be written as Twenty-one billion, two hundred eighty-five million, one hundred eighty-seven thousand, four hundred forty.

Scientific notation

• Scientific notation: 2.128518744 × 10¹⁰

Factors of 21285187440

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 2183

Divisors of 21285187440

• Number of divisors d(n): 240
• Complete list of divisors:
  1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 30 33 40 44 48 55 60 66 80 88 110 120 121 132 165 176 220 240 242 264 330 363 421 440 484 528 605 660 726 842 880 968 1210 1263 1320 1452 1684 1741 1815 1936 2105 2420 2526 2640 2904 3368 3482 3630 4210 4631 4840 5052 5223 5808 6315 6736 6964 7260 8420 8705 9262 9680 10104 10446 12630 13893 13928 14520 16840 17410 18524 19151 20208 20892 23155 25260 26115 27786 27856 29040 33680 34820 37048 38302 41784 46310 50520 50941 52230 55572 57453 69465 69640 74096 76604 83568 92620 95755 101040 101882 104460 111144 114906 138930 139280 152823 153208 185240 191510 203764 208920 210661 222288 229812 254705 277860 287265 305646 306416 370480 383020 407528 417840 421322 459624 509410 555720 574530 611292 631983 732961 764115 766040 815056 842644 919248 1018820 1053305 1111440 1149060 1222584 1263966 1465922 1528230 1532080 1685288 2037640 2106610 2198883 2298120 2445168 2527932 2931844 3056460 3159915 3370576 3664805 4075280 4213220 4397766 4596240 5055864 5863688 6112920 6319830 7329610 8062571 8426440 8795532 10111728 10994415 11727376 12225840 12639660 14659220 16125142 16852880 17591064 21988830 24187713 25279320 29318440 32250284 35182128 40312855 43977660 48375426 50558640 58636880 64500568 80625710 87955320 88688281 96750852 120938565 129001136 161251420 175910640 177376562 193501704 241877130 266064843 322502840 354753124 387003408 443441405 483754260 532129686 645005680 709506248 886882810 967508520 1064259372 1330324215 1419012496 1773765620 1935017040 2128518744 2660648430 3547531240 4257037488 5321296860 7095062480 10642593720 21285187440
• Sum of all divisors σ(n): 72741990048
• Sum of proper divisors (its aliquot sum) s(n): 51456802608
• 21285187440 is an abundant number, because the sum of its proper divisors (51456802608) is greater than itself. Its abundance is 30171615168

Bases of 21285187440

• Binary: 10011110100101100100010111101110000₂
• Hexadecimal: 0x4F4B22F70
• Base-36: 9S0NFQO

Squares and roots of 21285187440

• 21285187440 squared (21285187440²) is 453059204355933753600
• 21285187440 cubed (21285187440³) is 9643450086133314421598774784000
• The square root of 21285187440 is 145894.4393731303
• The cube root of 21285187440 is 2771.3571197487

Scales and comparisons

• 21,285,187,440 seconds is equal to 676 years, 41 weeks, 5 days, 8 hours, 4 minutes.
• To count from 1 to 21,285,187,440 would take you about one thousand, three hundred fifty-three 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 21285187440 cubic inches would be around 230.9 feet tall.

Recreational maths with 21285187440

• 21285187440 backwards is 04478158212
• The number of decimal digits it has is: 11
• The sum of 21285187440's digits is 42
• More coming soon!