21091840

Names of 21091840

• Cardinal: 21091840 can be written as Twenty-one million, ninety-one thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.109184 × 10⁷

Factors of 21091840

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 132

Divisors of 21091840

• Number of divisors d(n): 160
• Complete list of divisors:
  1 2 4 5 7 8 10 11 14 16 20 22 28 32 35 40 44 55 56 64 70 77 80 88 107 110 112 128 140 154 160 176 214 220 224 256 280 308 320 352 385 428 440 448 512 535 560 616 640 704 749 770 856 880 896 1070 1120 1177 1232 1280 1408 1498 1540 1712 1760 1792 2140 2240 2354 2464 2560 2816 2996 3080 3424 3520 3584 3745 4280 4480 4708 4928 5632 5885 5992 6160 6848 7040 7490 8239 8560 8960 9416 9856 11770 11984 12320 13696 14080 14980 16478 17120 17920 18832 19712 23540 23968 24640 27392 28160 29960 32956 34240 37664 39424 41195 47080 47936 49280 54784 59920 65912 68480 75328 82390 94160 95872 98560 119840 131824 136960 150656 164780 188320 191744 197120 239680 263648 273920 301312 329560 376640 383488 479360 527296 602624 659120 753280 958720 1054592 1318240 1506560 1917440 2109184 2636480 3013120 4218368 5272960 10545920 21091840
• Sum of all divisors σ(n): 63638784
• Sum of proper divisors (its aliquot sum) s(n): 42546944
• 21091840 is an abundant number, because the sum of its proper divisors (42546944) is greater than itself. Its abundance is 21455104

Bases of 21091840

• Binary: 1010000011101011000000000₂
• Hexadecimal: 0x141D600
• Base-36: CK2KG

Squares and roots of 21091840

• 21091840 squared (21091840²) is 444865714585600
• 21091840 cubed (21091840³) is 9383036473525141504000
• The square root of 21091840 is 4592.5853285487
• The cube root of 21091840 is 276.2940225905

Scales and comparisons

• 21,091,840 seconds is equal to 34 weeks, 6 days, 2 hours, 50 minutes, 40 seconds.
• To count from 1 to 21,091,840 would take you about two days!

  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 21091840 cubic inches would be around 23 feet tall.

Recreational maths with 21091840

• 21091840 backwards is 04819012
• The number of decimal digits it has is: 8
• The sum of 21091840's digits is 25
• More coming soon!