21213281920

Names of 21213281920

• Cardinal: 21213281920 can be written as Twenty-one billion, two hundred thirteen million, two hundred eighty-one thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 2.121328192 × 10¹⁰

Factors of 21213281920

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 595

Divisors of 21213281920

• Number of divisors d(n): 256
• Complete list of divisors:
  1 2 4 5 8 10 16 20 29 32 40 41 58 61 64 80 82 116 122 128 145 160 164 205 232 244 290 305 320 328 410 457 464 488 580 610 640 656 820 914 928 976 1160 1189 1220 1312 1640 1769 1828 1856 1952 2285 2320 2378 2440 2501 2624 3280 3538 3656 3712 3904 4570 4640 4756 4880 5002 5248 5945 6560 7076 7312 7808 8845 9140 9280 9512 9760 10004 11890 12505 13120 13253 14152 14624 17690 18280 18560 18737 19024 19520 20008 23780 25010 26240 26506 27877 28304 29248 35380 36560 37474 38048 39040 40016 47560 50020 53012 55754 56608 58496 66265 70760 72529 73120 74948 76096 80032 93685 95120 100040 106024 111508 113216 132530 139385 141520 145058 146240 149896 152192 160064 187370 190240 200080 212048 223016 226432 265060 278770 283040 290116 292480 299792 320128 362645 374740 380480 400160 424096 446032 530120 543373 557540 566080 580232 599584 725290 749480 760960 800320 808433 848192 892064 1060240 1086746 1115080 1132160 1142957 1160464 1199168 1450580 1498960 1600640 1616866 1696384 1784128 2120480 2173492 2230160 2285914 2320928 2398336 2716865 2901160 2997920 3233732 3568256 4042165 4240960 4346984 4460320 4571828 4641856 5433730 5714785 5802320 5995840 6467464 8084330 8481920 8693968 8920640 9143656 9283712 10867460 11429570 11604640 11991680 12934928 16168660 17387936 17841280 18287312 21734920 22859140 23209280 25869856 32337320 33145753 34775872 36574624 43469840 45718280 46418560 51739712 64674640 66291506 69551744 73149248 86939680 91436560 103479424 129349280 132583012 146298496 165728765 173879360 182873120 258698560 265166024 331457530 347758720 365746240 517397120 530332048 662915060 731492480 1060664096 1325830120 2121328192 2651660240 4242656384 5303320480 10606640960 21213281920
• Sum of all divisors σ(n): 54741808800
• Sum of proper divisors (its aliquot sum) s(n): 33528526880
• 21213281920 is an abundant number, because the sum of its proper divisors (33528526880) is greater than itself. Its abundance is 12315244960

Bases of 21213281920

• Binary: 10011110000011010001111111010000000₂
• Hexadecimal: 0x4F068FE80
• Base-36: 9QTU934

Squares and roots of 21213281920

• 21213281920 squared (21213281920²) is 450003329817398886400
• 21213281920 cubed (21213281920³) is 9546047500355224698297253888000
• The square root of 21213281920 is 145647.8009446075
• The cube root of 21213281920 is 2768.2328704703

Scales and comparisons

• 21,213,281,920 seconds is equal to 674 years, 26 weeks, 6 days, 2 hours, 18 minutes, 40 seconds.
• To count from 1 to 21,213,281,920 would take you about one thousand, three hundred forty-nine 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 21213281920 cubic inches would be around 230.7 feet tall.

Recreational maths with 21213281920

• 21213281920 backwards is 02918231212
• The number of decimal digits it has is: 11
• The sum of 21213281920's digits is 31
• More coming soon!