21135429840

Names of 21135429840

• Cardinal: 21135429840 can be written as Twenty-one billion, one hundred thirty-five million, four hundred twenty-nine thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.113542984 × 10¹⁰

Factors of 21135429840

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 12580630

Divisors of 21135429840

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 28 30 35 40 42 48 56 60 70 80 84 105 112 120 140 168 210 240 280 336 420 560 840 1680 12580613 25161226 37741839 50322452 62903065 75483678 88064291 100644904 125806130 150967356 176128582 188709195 201289808 251612260 264192873 301934712 352257164 377418390 440321455 503224520 528385746 603869424 704514328 754836780 880642910 1006449040 1056771492 1320964365 1409028656 1509673560 1761285820 2113542984 2641928730 3019347120 3522571640 4227085968 5283857460 7045143280 10567714920 21135429840
• Sum of all divisors σ(n): 74879814528
• Sum of proper divisors (its aliquot sum) s(n): 53744384688
• 21135429840 is an abundant number, because the sum of its proper divisors (53744384688) is greater than itself. Its abundance is 32608954848

Bases of 21135429840

• Binary: 10011101011110001010001000011010000₂
• Hexadecimal: 0x4EBC510D0
• Base-36: 9PJHM1C

Squares and roots of 21135429840

• 21135429840 squared (21135429840²) is 446706394521562425600
• 21135429840 cubed (21135429840³) is 9441331660489843013449019904000
• The square root of 21135429840 is 145380.2938503015
• The cube root of 21135429840 is 2764.8422766565

Scales and comparisons

• 21,135,429,840 seconds is equal to 672 years, 2 weeks, 1 day, 44 minutes.
• To count from 1 to 21,135,429,840 would take you about one thousand, three hundred forty-four 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 21135429840 cubic inches would be around 230.4 feet tall.

Recreational maths with 21135429840

• 21135429840 backwards is 04892453112
• The number of decimal digits it has is: 11
• The sum of 21135429840's digits is 39
• More coming soon!