21381920

Names of 21381920

• Cardinal: 21381920 can be written as Twenty-one million, three hundred eighty-one thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 2.138192 × 10⁷

Factors of 21381920

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 1154

Divisors of 21381920

• Number of divisors d(n): 96
• Complete list of divisors:
  1 2 4 5 7 8 10 14 16 17 20 28 32 34 35 40 56 68 70 80 85 112 119 136 140 160 170 224 238 272 280 340 476 544 560 595 680 952 1120 1123 1190 1360 1904 2246 2380 2720 3808 4492 4760 5615 7861 8984 9520 11230 15722 17968 19040 19091 22460 31444 35936 38182 39305 44920 62888 76364 78610 89840 95455 125776 133637 152728 157220 179680 190910 251552 267274 305456 314440 381820 534548 610912 628880 668185 763640 1069096 1257760 1336370 1527280 2138192 2672740 3054560 4276384 5345480 10690960 21381920
• Sum of all divisors σ(n): 61181568
• Sum of proper divisors (its aliquot sum) s(n): 39799648
• 21381920 is an abundant number, because the sum of its proper divisors (39799648) is greater than itself. Its abundance is 18417728

Bases of 21381920

• Binary: 1010001100100001100100000₂
• Hexadecimal: 0x1464320
• Base-36: CQAE8

Squares and roots of 21381920

• 21381920 squared (21381920²) is 457186502886400
• 21381920 cubed (21381920³) is 9775525229796773888000
• The square root of 21381920 is 4624.0588231551
• The cube root of 21381920 is 277.5549008059

Scales and comparisons

• 21,381,920 seconds is equal to 35 weeks, 2 days, 11 hours, 25 minutes, 20 seconds.
• To count from 1 to 21,381,920 would take you about five hours!

  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 21381920 cubic inches would be around 23.1 feet tall.

Recreational maths with 21381920

• 21381920 backwards is 02918312
• The number of decimal digits it has is: 8
• The sum of 21381920's digits is 26
• More coming soon!