21081521664

Names of 21081521664

• Cardinal: 21081521664 can be written as Twenty-one billion, eighty-one million, five hundred twenty-one thousand, six hundred sixty-four.

Scientific notation

• Scientific notation: 2.1081521664 × 10¹⁰

Factors of 21081521664

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 15
• Sum of prime factors: 1364

Divisors of 21081521664

• Number of divisors d(n): 360
• Complete list of divisors:
  1 2 3 4 6 7 8 9 12 14 16 18 21 24 28 32 36 42 48 49 56 63 64 72 73 84 96 98 112 126 128 144 146 147 168 192 196 219 224 252 256 288 292 294 336 384 392 438 441 448 504 511 512 576 584 588 657 672 768 784 876 882 896 1008 1022 1152 1168 1176 1279 1314 1344 1533 1536 1568 1752 1764 1792 2016 2044 2304 2336 2352 2558 2628 2688 3066 3136 3504 3528 3577 3584 3837 4032 4088 4599 4608 4672 4704 5116 5256 5376 6132 6272 7008 7056 7154 7674 8064 8176 8953 9198 9344 9408 10232 10512 10731 10752 11511 12264 12544 14016 14112 14308 15348 16128 16352 17906 18396 18688 18816 20464 21024 21462 23022 24528 25088 26859 28032 28224 28616 30696 32193 32256 32704 35812 36792 37376 37632 40928 42048 42924 46044 49056 53718 56064 56448 57232 61392 62671 64386 65408 71624 73584 75264 80577 81856 84096 85848 92088 93367 98112 107436 112128 112896 114464 122784 125342 128772 130816 143248 147168 161154 163712 168192 171696 184176 186734 188013 196224 214872 225792 228928 245568 250684 257544 261632 280101 286496 294336 322308 327424 336384 343392 368352 373468 376026 392448 429744 457856 491136 501368 515088 560202 564039 572992 588672 644616 653569 654848 686784 736704 746936 752052 784896 840303 859488 915712 982272 1002736 1030176 1120404 1128078 1145984 1177344 1289232 1307138 1373568 1473408 1493872 1504104 1680606 1718976 1831424 1960707 1964544 2005472 2060352 2240808 2256156 2291968 2354688 2578464 2614276 2747136 2946816 2987744 3008208 3361212 3437952 3921414 4010944 4120704 4481616 4512312 4574983 4583936 5156928 5228552 5494272 5882121 5893632 5975488 6016416 6722424 6875904 7842828 8021888 8241408 8963232 9024624 9149966 10313856 10457104 11764242 11950976 12032832 13444848 13724949 13751808 15685656 16043776 16482816 17926464 18049248 18299932 20627712 20914208 23528484 23901952 24065664 26889696 27449898 31371312 32087552 35852928 36098496 36599864 41174847 41255424 41828416 47056968 47803904 48131328 53779392 54899796 62742624 71705856 72196992 73199728 82349694 83656832 94113936 96262656 107558784 109799592 125485248 143411712 144393984 146399456 164699388 167313664 188227872 215117568 219599184 250970496 288787968 292798912 329398776 334627328 376455744 430235136 439198368 501940992 585597824 658797552 752911488 878396736 1003881984 1171195648 1317595104 1505822976 1756793472 2342391296 2635190208 3011645952 3513586944 5270380416 7027173888 10540760832 21081521664
• Sum of all divisors σ(n): 71801832960
• Sum of proper divisors (its aliquot sum) s(n): 50720311296
• 21081521664 is an abundant number, because the sum of its proper divisors (50720311296) is greater than itself. Its abundance is 29638789632

Bases of 21081521664

• Binary: 10011101000100011100111111000000000₂
• Hexadecimal: 0x4E88E7E00
• Base-36: 9ONE680

Squares and roots of 21081521664

• 21081521664 squared (21081521664²) is 444430555669701328896
• 21081521664 cubed (21081521664³) is 9369272387494366593530613202944
• The square root of 21081521664 is 145194.7714761107
• The cube root of 21081521664 is 2762.4895998845

Scales and comparisons

• 21,081,521,664 seconds is equal to 670 years, 17 weeks, 2 hours, 14 minutes, 24 seconds.
• To count from 1 to 21,081,521,664 would take you about one thousand, three hundred forty 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 21081521664 cubic inches would be around 230.2 feet tall.

Recreational maths with 21081521664

• 21081521664 backwards is 46612518012
• 21081521664 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21081521664's digits is 36
• More coming soon!