21395220

Names of 21395220

• Cardinal: 21395220 can be written as Twenty-one million, three hundred ninety-five thousand, two hundred twenty.

Scientific notation

• Scientific notation: 2.139522 × 10⁷

Factors of 21395220

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 449

Divisors of 21395220

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 5 6 7 10 11 12 14 15 20 21 22 28 30 33 35 42 44 55 60 66 70 77 84 105 110 121 132 140 154 165 210 220 231 242 308 330 363 385 420 421 462 484 605 660 726 770 842 847 924 1155 1210 1263 1452 1540 1684 1694 1815 2105 2310 2420 2526 2541 2947 3388 3630 4210 4235 4620 4631 5052 5082 5894 6315 7260 8420 8470 8841 9262 10164 11788 12630 12705 13893 14735 16940 17682 18524 23155 25260 25410 27786 29470 32417 35364 44205 46310 50820 50941 55572 58940 64834 69465 88410 92620 97251 101882 129668 138930 152823 162085 176820 194502 203764 254705 277860 305646 324170 356587 389004 486255 509410 611292 648340 713174 764115 972510 1018820 1069761 1426348 1528230 1782935 1945020 2139522 3056460 3565870 4279044 5348805 7131740 10697610 21395220
• Sum of all divisors σ(n): 75433344
• Sum of proper divisors (its aliquot sum) s(n): 54038124
• 21395220 is an abundant number, because the sum of its proper divisors (54038124) is greater than itself. Its abundance is 32642904

Bases of 21395220

• Binary: 1010001100111011100010100₂
• Hexadecimal: 0x1467714
• Base-36: CQKNO

Squares and roots of 21395220

• 21395220 squared (21395220²) is 457755438848400
• 21395220 cubed (21395220³) is 9793778320358064648000
• The square root of 21395220 is 4625.4967300821
• The cube root of 21395220 is 277.6124371897

Scales and comparisons

• 21,395,220 seconds is equal to 35 weeks, 2 days, 15 hours, 7 minutes.
• To count from 1 to 21,395,220 would take you about ten 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 21395220 cubic inches would be around 23.1 feet tall.

Recreational maths with 21395220

• 21395220 backwards is 02259312
• The number of decimal digits it has is: 8
• The sum of 21395220's digits is 24
• More coming soon!