21128505948

Names of 21128505948

• Cardinal: 21128505948 can be written as Twenty-one billion, one hundred twenty-eight million, five hundred five thousand, nine hundred forty-eight.

Scientific notation

• Scientific notation: 2.1128505948 × 10¹⁰

Factors of 21128505948

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 1721170

Divisors of 21128505948

• Number of divisors d(n): 72
• Complete list of divisors:
  1 2 3 4 6 9 11 12 18 22 31 33 36 44 62 66 93 99 124 132 186 198 279 341 372 396 558 682 1023 1116 1364 2046 3069 4092 6138 12276 1721123 3442246 5163369 6884492 10326738 15490107 18932353 20653476 30980214 37864706 53354813 56797059 61960428 75729412 106709626 113594118 160064439 170391177 213419252 227188236 320128878 340782354 480193317 586902943 640257756 681564708 960386634 1173805886 1760708829 1920773268 2347611772 3521417658 5282126487 7042835316 10564252974 21128505948
• Sum of all divisors σ(n): 60142957056
• Sum of proper divisors (its aliquot sum) s(n): 39014451108
• 21128505948 is an abundant number, because the sum of its proper divisors (39014451108) is greater than itself. Its abundance is 17885945160

Bases of 21128505948

• Binary: 10011101011010110110110101001011100₂
• Hexadecimal: 0x4EB5B6A5C
• Base-36: 9PFD7J0

Squares and roots of 21128505948

• 21128505948 squared (21128505948²) is 446413763594671378704
• 21128505948 cubed (21128505948³) is 9432055859379080086052824531392
• The square root of 21128505948 is 145356.4788648927
• The cube root of 21128505948 is 2764.5403261671

Scales and comparisons

• 21,128,505,948 seconds is equal to 671 years, 42 weeks, 4 days, 21 hours, 25 minutes, 48 seconds.
• To count from 1 to 21,128,505,948 would take you about one thousand, three hundred forty-three 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 21128505948 cubic inches would be around 230.4 feet tall.

Recreational maths with 21128505948

• 21128505948 backwards is 84950582112
• The number of decimal digits it has is: 11
• The sum of 21128505948's digits is 45
• More coming soon!