21021781440

Names of 21021781440

• Cardinal: 21021781440 can be written as Twenty-one billion, twenty-one million, seven hundred eighty-one thousand, four hundred forty.

Scientific notation

• Scientific notation: 2.102178144 × 10¹⁰

Factors of 21021781440

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 4441

Divisors of 21021781440

• Number of divisors d(n): 224
• Complete list of divisors:
  1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 30 32 33 40 44 48 55 60 64 66 80 88 96 110 120 132 160 165 176 192 220 240 264 320 330 352 440 480 509 528 660 704 880 960 1018 1056 1320 1527 1760 2036 2112 2545 2640 3054 3520 3911 4072 5090 5280 5599 6108 7635 7822 8144 10180 10560 11198 11733 12216 15270 15644 16288 16797 19555 20360 22396 23466 24432 27995 30540 31288 32576 33594 39110 40720 43021 44792 46932 48864 55990 58665 61080 62576 67188 78220 81440 83985 86042 89584 93864 97728 111980 117330 122160 125152 129063 134376 156440 162880 167970 172084 179168 187728 215105 223960 234660 244320 250304 258126 268752 312880 335940 344168 358336 375456 430210 447920 469320 488640 516252 537504 625760 645315 671880 688336 750912 860420 895840 938640 1032504 1075008 1251520 1290630 1343760 1376672 1720840 1791680 1877280 1990699 2065008 2581260 2687520 2753344 3441680 3754560 3981398 4130016 5162520 5375040 5972097 6883360 7962796 8260032 9953495 10325040 11944194 13766720 15925592 19906990 20650080 21897689 23888388 29860485 31851184 39813980 41300160 43795378 47776776 59720970 63702368 65693067 79627960 87590756 95553552 109488445 119441940 127404736 131386134 159255920 175181512 191107104 218976890 238883880 262772268 318511840 328465335 350363024 382214208 437953780 477767760 525544536 637023680 656930670 700726048 875907560 955535520 1051089072 1313861340 1401452096 1751815120 1911071040 2102178144 2627722680 3503630240 4204356288 5255445360 7007260480 10510890720 21021781440
• Sum of all divisors σ(n): 72973509120
• Sum of proper divisors (its aliquot sum) s(n): 51951727680
• 21021781440 is an abundant number, because the sum of its proper divisors (51951727680) is greater than itself. Its abundance is 30929946240

Bases of 21021781440

• Binary: 10011100100111111101110110111000000₂
• Hexadecimal: 0x4E4FEEDC0
• Base-36: 9NNTQDC

Squares and roots of 21021781440

• 21021781440 squared (21021781440²) is 441915294911128473600
• 21021781440 cubed (21021781440³) is 9289846744614886995780009984000
• The square root of 21021781440 is 144988.9010924629
• The cube root of 21021781440 is 2759.8777093475

Scales and comparisons

• 21,021,781,440 seconds is equal to 668 years, 22 weeks, 1 day, 15 hours, 44 minutes.
• To count from 1 to 21,021,781,440 would take you about one thousand, three hundred thirty-six 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 21021781440 cubic inches would be around 230 feet tall.

Recreational maths with 21021781440

• 21021781440 backwards is 04418712012
• 21021781440 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21021781440's digits is 30
• More coming soon!