21155858640

Names of 21155858640

• Cardinal: 21155858640 can be written as Twenty-one billion, one hundred fifty-five million, eight hundred fifty-eight thousand, six hundred forty.

Scientific notation

• Scientific notation: 2.115585864 × 10¹⁰

Factors of 21155858640

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 6657

Divisors of 21155858640

• Number of divisors d(n): 400
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 27 28 30 35 36 40 42 45 48 54 56 60 63 70 71 72 80 81 84 90 105 108 112 120 126 135 140 142 144 162 168 180 189 210 213 216 240 252 270 280 284 315 324 336 355 360 378 405 420 426 432 497 504 540 560 567 568 630 639 648 710 720 756 810 840 852 945 994 1008 1065 1080 1134 1136 1260 1278 1296 1420 1491 1512 1620 1680 1704 1890 1917 1988 2130 2160 2268 2485 2520 2556 2835 2840 2982 3024 3195 3240 3408 3780 3834 3976 4260 4473 4536 4970 5040 5112 5670 5680 5751 5964 6390 6480 6569 7455 7560 7668 7952 8520 8946 9072 9585 9940 10224 11340 11502 11928 12780 13138 13419 14910 15120 15336 17040 17892 19170 19707 19880 22365 22680 23004 23856 25560 26276 26838 28755 29820 30672 32845 35784 38340 39414 39760 40257 44730 45360 45983 46008 51120 52552 53676 57510 59121 59640 65690 67095 71568 76680 78828 80514 89460 91966 92016 98535 105104 107352 115020 118242 119280 131380 134190 137949 153360 157656 161028 177363 178920 183932 197070 201285 214704 229915 230040 236484 262760 268380 275898 295605 315312 322056 354726 357840 367864 394140 402570 413847 459830 460080 466399 472968 525520 532089 536760 551796 591210 644112 689745 709452 735728 788280 805140 827694 886815 919660 932798 945936 1064178 1073520 1103592 1182420 1241541 1379490 1399197 1418904 1576560 1610280 1655388 1773630 1839320 1865596 2069235 2128356 2207184 2331995 2364840 2483082 2660445 2758980 2798394 2837808 3220560 3264793 3310776 3547260 3678640 3724623 3731192 4138470 4197591 4256712 4663990 4729680 4966164 5320890 5517960 5596788 6207705 6529586 6621552 6995985 7094520 7449246 7462384 8276940 8395182 8513424 9327980 9794379 9932328 10641780 11035920 11193576 12415410 12592773 13059172 13991970 14189040 14898492 16323965 16553880 16790364 18623115 18655960 19588758 19864656 20987955 21283560 22387152 24830820 25185546 26118344 27983940 29383137 29796984 32647930 33107760 33580728 37246230 37311920 37778319 39177516 41975910 42567120 48971895 49661640 50371092 52236688 55967880 58766274 59593968 62963865 65295860 67161456 74492460 75556638 78355032 83951820 88149411 97943790 99323280 100742184 111935760 117532548 125927730 130591720 146915685 148984920 151113276 156710064 167903640 176298822 188891595 195887580 201484368 235065096 251855460 261183440 264448233 293831370 297969840 302226552 335807280 352597644 377783190 391775160 440747055 470130192 503710920 528896466 587662740 604453104 705195288 755566380 783550320 881494110 1007421840 1057792932 1175325480 1322241165 1410390576 1511132760 1762988220 2115585864 2350650960 2644482330 3022265520 3525976440 4231171728 5288964660 7051952880 10577929320 21155858640
• Sum of all divisors σ(n): 85169905920
• Sum of proper divisors (its aliquot sum) s(n): 64014047280
• 21155858640 is an abundant number, because the sum of its proper divisors (64014047280) is greater than itself. Its abundance is 42858188640

Bases of 21155858640

• Binary: 10011101100111111001100100011010000₂
• Hexadecimal: 0x4ECFCC8D0
• Base-36: 9PVNH00

Squares and roots of 21155858640

• 21155858640 squared (21155858640²) is 447570354795662649600
• 21155858640 cubed (21155858640³) is 9468735157511685100065452544000
• The square root of 21155858640 is 145450.5367470329
• The cube root of 21155858640 is 2765.7327911793

Scales and comparisons

• 21,155,858,640 seconds is equal to 672 years, 35 weeks, 6 days, 11 hours, 24 minutes.
• To count from 1 to 21,155,858,640 would take you about one thousand, three hundred forty-five 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 21155858640 cubic inches would be around 230.5 feet tall.

Recreational maths with 21155858640

• 21155858640 backwards is 04685855112
• 21155858640 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21155858640's digits is 45
• More coming soon!