21213920

Names of 21213920

• Cardinal: 21213920 can be written as Twenty-one million, two hundred thirteen thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 2.121392 × 10⁷

Factors of 21213920

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 105

Divisors of 21213920

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 4 5 7 8 10 13 14 16 20 26 28 31 32 35 40 47 52 56 62 65 70 80 91 94 104 112 124 130 140 155 160 182 188 208 217 224 235 248 260 280 310 329 364 376 403 416 434 455 470 496 520 560 611 620 658 728 752 806 868 910 940 992 1040 1085 1120 1222 1240 1316 1456 1457 1504 1612 1645 1736 1820 1880 2015 2080 2170 2444 2480 2632 2821 2912 2914 3055 3224 3290 3472 3640 3760 4030 4277 4340 4888 4960 5264 5642 5828 6110 6448 6580 6944 7280 7285 7520 8060 8554 8680 9776 10199 10528 11284 11656 12220 12896 13160 14105 14560 14570 16120 17108 17360 18941 19552 20398 21385 22568 23312 24440 26320 28210 29140 32240 34216 34720 37882 40796 42770 45136 46624 48880 50995 52640 56420 58280 64480 68432 75764 81592 85540 90272 94705 97760 101990 112840 116560 132587 136864 151528 163184 171080 189410 203980 225680 233120 265174 303056 326368 342160 378820 407960 451360 530348 606112 662935 684320 757640 815920 1060696 1325870 1515280 1631840 2121392 2651740 3030560 4242784 5303480 10606960 21213920
• Sum of all divisors σ(n): 65028096
• Sum of proper divisors (its aliquot sum) s(n): 43814176
• 21213920 is an abundant number, because the sum of its proper divisors (43814176) is greater than itself. Its abundance is 22600256

Bases of 21213920

• Binary: 1010000111011001011100000₂
• Hexadecimal: 0x143B2E0
• Base-36: CMORK

Squares and roots of 21213920

• 21213920 squared (21213920²) is 450030401766400
• 21213920 cubed (21213920³) is 9546908940640268288000
• The square root of 21213920 is 4605.8571406417
• The cube root of 21213920 is 276.8260625665

Scales and comparisons

• 21,213,920 seconds is equal to 35 weeks, 12 hours, 45 minutes, 20 seconds.
• To count from 1 to 21,213,920 would take you about four 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 21213920 cubic inches would be around 23.1 feet tall.

Recreational maths with 21213920

• 21213920 backwards is 02931212
• 21213920 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21213920's digits is 20
• More coming soon!