21393653742

Names of 21393653742

• Cardinal: 21393653742 can be written as Twenty-one billion, three hundred ninety-three million, six hundred fifty-three thousand, seven hundred forty-two.

Scientific notation

• Scientific notation: 2.1393653742 × 10¹⁰

Factors of 21393653742

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 354

Divisors of 21393653742

• Number of divisors d(n): 120
• Complete list of divisors:
  1 2 3 6 9 18 27 29 54 58 81 87 139 162 174 181 261 278 362 417 522 543 783 834 1086 1251 1566 1629 2349 2502 3258 3753 4031 4698 4887 5249 7506 8062 9774 10498 11259 12093 14661 15747 22518 24186 25159 29322 31494 32761 36279 47241 50318 65522 72558 75477 94482 98283 108837 141723 150954 196566 217674 226431 283446 294849 326511 425169 452862 589698 653022 679293 729611 850338 884547 950069 1358586 1459222 1769094 1900138 2037879 2188833 2653641 2850207 4075758 4377666 4553779 5307282 5700414 6566499 8550621 9107558 13132998 13661337 17101242 19699497 25651863 27322674 39398994 40984011 51303726 59098491 76955589 81968022 118196982 122952033 132059591 153911178 245904066 264119182 368856099 396178773 737712198 792357546 1188536319 2377072638 3565608957 7131217914 10696826871 21393653742
• Sum of all divisors σ(n): 50224897800
• Sum of proper divisors (its aliquot sum) s(n): 28831244058
• 21393653742 is an abundant number, because the sum of its proper divisors (28831244058) is greater than itself. Its abundance is 7437590316

Bases of 21393653742

• Binary: 10011111011001010010011111111101110₂
• Hexadecimal: 0x4FB293FEE
• Base-36: 9TT88VI

Squares and roots of 21393653742

• 21393653742 squared (21393653742²) is 457688420432590602564
• 21393653742 cubed (21393653742³) is 9791627588457761203297353394488
• The square root of 21393653742 is 146265.6957116057
• The cube root of 21393653742 is 2776.0566272773

Scales and comparisons

• 21,393,653,742 seconds is equal to 680 years, 13 weeks, 17 hours, 35 minutes, 42 seconds.
• To count from 1 to 21,393,653,742 would take you about one thousand, three hundred sixty 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 21393653742 cubic inches would be around 231.3 feet tall.

Recreational maths with 21393653742

• 21393653742 backwards is 24735639312
• The number of decimal digits it has is: 11
• The sum of 21393653742's digits is 45
• More coming soon!