21389743928

Names of 21389743928

• Cardinal: 21389743928 can be written as Twenty-one billion, three hundred eighty-nine million, seven hundred forty-three thousand, nine hundred twenty-eight.

Scientific notation

• Scientific notation: 2.1389743928 × 10¹⁰

Factors of 21389743928

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 30296

Divisors of 21389743928

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 4 7 8 14 28 56 97 131 194 262 388 524 679 776 917 1048 1358 1834 2716 3668 5432 7336 12707 25414 30059 50828 60118 88949 101656 120236 177898 210413 240472 355796 420826 711592 841652 1683304 2915723 3937729 5831446 7875458 11662892 15750916 20410061 23325784 27564103 31501832 40820122 55128206 81640244 110256412 163280488 220512824 381959713 763919426 1527838852 2673717991 3055677704 5347435982 10694871964 21389743928
• Sum of all divisors σ(n): 46662739200
• Sum of proper divisors (its aliquot sum) s(n): 25272995272
• 21389743928 is an abundant number, because the sum of its proper divisors (25272995272) is greater than itself. Its abundance is 3883251344

Bases of 21389743928

• Binary: 10011111010111011011001011100111000₂
• Hexadecimal: 0x4FAED9738
• Base-36: 9TQWG1K

Squares and roots of 21389743928

• 21389743928 squared (21389743928²) is 457521145305412869184
• 21389743928 cubed (21389743928³) is 9786260139728060624161522314752
• The square root of 21389743928 is 146252.3296498213
• The cube root of 21389743928 is 2775.8875035039

Scales and comparisons

• 21,389,743,928 seconds is equal to 680 years, 6 weeks, 4 days, 11 hours, 32 minutes, 8 seconds.
• To count from 1 to 21,389,743,928 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 21389743928 cubic inches would be around 231.3 feet tall.

Recreational maths with 21389743928

• 21389743928 backwards is 82934798312
• 21389743928 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21389743928's digits is 56
• More coming soon!