21128645664

Names of 21128645664

• Cardinal: 21128645664 can be written as Twenty-one billion, one hundred twenty-eight million, six hundred forty-five thousand, six hundred sixty-four.

Scientific notation

• Scientific notation: 2.1128645664 × 10¹⁰

Factors of 21128645664

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 1015

Divisors of 21128645664

• Number of divisors d(n): 384
• Complete list of divisors:
  1 2 3 4 6 7 8 9 12 14 16 18 21 23 24 27 28 32 36 42 46 48 54 56 63 69 72 84 92 96 108 112 126 138 144 161 168 184 189 193 207 216 224 252 276 288 322 336 368 378 386 414 432 483 504 552 579 621 644 672 736 756 772 787 828 864 966 1008 1104 1158 1242 1288 1351 1449 1512 1544 1574 1656 1737 1932 2016 2208 2316 2361 2484 2576 2702 2898 3024 3088 3148 3312 3474 3864 4053 4347 4439 4632 4722 4968 5152 5211 5404 5509 5796 6048 6176 6296 6624 6948 7083 7728 8106 8694 8878 9264 9444 9936 10422 10808 11018 11592 12159 12592 13317 13896 14166 15456 16212 16527 17388 17756 18101 18528 18888 19872 20844 21249 21616 22036 23184 24318 25184 26634 27792 28332 31073 32424 33054 34776 35512 36202 36477 37776 39951 41688 42498 43232 44072 46368 48636 49581 53268 54303 55584 56664 62146 64848 66108 69552 71024 72404 72954 75552 79902 83376 84996 88144 93219 97272 99162 106536 108606 113328 119853 124292 126707 129696 132216 139104 142048 144808 145908 148743 151891 159804 162909 166752 169992 176288 186438 194544 198324 213072 217212 226656 239706 248584 253414 264432 279657 289616 291816 297486 303782 319608 325818 339984 372876 380121 389088 396648 426144 434424 455673 479412 488727 497168 506828 528864 559314 579232 583632 594972 607564 639216 651636 679968 745752 760242 793296 838971 868848 911346 958824 977454 994336 1013656 1063237 1118628 1140363 1167264 1189944 1215128 1278432 1303272 1367019 1491504 1520484 1586592 1677942 1737696 1822692 1917648 1954908 2027312 2126474 2237256 2280726 2379888 2430256 2606544 2734038 2983008 3040968 3189711 3355884 3421089 3493493 3645384 3835296 3909816 4054624 4101057 4252948 4474512 4561452 4759776 4860512 5213088 5468076 6081936 6379422 6711768 6842178 6986986 7290768 7819632 8202114 8505896 8949024 9122904 9569133 10480479 10936152 12163872 12758844 13423536 13684356 13973972 14581536 15639264 16404228 17011792 18245808 19138266 20960958 21872304 24454451 25517688 26847072 27368712 27947944 28707399 31441437 32808456 34023584 36491616 38276532 41921916 43744608 48908902 51035376 54737424 55895888 57414798 62882874 65616912 73363353 76553064 83843832 94324311 97817804 102070752 109474848 111791776 114829596 125765748 131233824 146726706 153106128 167687664 188648622 195635608 220090059 229659192 251531496 293453412 306212256 335375328 377297244 391271216 440180118 459318384 503062992 586906824 660270177 754594488 782542432 880360236 918636768 1006125984 1173813648 1320540354 1509188976 1760720472 2347627296 2641080708 3018377952 3521440944 5282161416 7042881888 10564322832 21128645664
• Sum of all divisors σ(n): 73965588480
• Sum of proper divisors (its aliquot sum) s(n): 52836942816
• 21128645664 is an abundant number, because the sum of its proper divisors (52836942816) is greater than itself. Its abundance is 31708297152

Bases of 21128645664

• Binary: 10011101011010111011000110000100000₂
• Hexadecimal: 0x4EB5D8C20
• Base-36: 9PFG7C0

Squares and roots of 21128645664

• 21128645664 squared (21128645664²) is 446419667594866000896
• 21128645664 cubed (21128645664³) is 9432242974052586838492290514944
• The square root of 21128645664 is 145356.9594618709
• The cube root of 21128645664 is 2764.5464198251

Scales and comparisons

• 21,128,645,664 seconds is equal to 671 years, 42 weeks, 6 days, 12 hours, 14 minutes, 24 seconds.
• To count from 1 to 21,128,645,664 would take you about one thousand, three hundred forty-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 21128645664 cubic inches would be around 230.4 feet tall.

Recreational maths with 21128645664

• 21128645664 backwards is 46654682112
• The number of decimal digits it has is: 11
• The sum of 21128645664's digits is 45
• More coming soon!