21099840

Names of 21099840

• Cardinal: 21099840 can be written as Twenty-one million, ninety-nine thousand, eight hundred forty.

Scientific notation

• Scientific notation: 2.109984 × 10⁷

Factors of 21099840

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 750

Divisors of 21099840

• Number of divisors d(n): 112
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 20 24 30 31 32 40 48 60 62 64 80 93 96 120 124 155 160 186 192 240 248 310 320 372 465 480 496 620 709 744 930 960 992 1240 1418 1488 1860 1984 2127 2480 2836 2976 3545 3720 4254 4960 5672 5952 7090 7440 8508 9920 10635 11344 14180 14880 17016 21270 21979 22688 28360 29760 34032 42540 43958 45376 56720 65937 68064 85080 87916 109895 113440 131874 136128 170160 175832 219790 226880 263748 329685 340320 351664 439580 527496 659370 680640 703328 879160 1054992 1318740 1406656 1758320 2109984 2637480 3516640 4219968 5274960 7033280 10549920 21099840
• Sum of all divisors σ(n): 69250560
• Sum of proper divisors (its aliquot sum) s(n): 48150720
• 21099840 is an abundant number, because the sum of its proper divisors (48150720) is greater than itself. Its abundance is 27050880

Bases of 21099840

• Binary: 1010000011111010101000000₂
• Hexadecimal: 0x141F540
• Base-36: CK8QO

Squares and roots of 21099840

• 21099840 squared (21099840²) is 445203248025600
• 21099840 cubed (21099840³) is 9393717300820475904000
• The square root of 21099840 is 4593.4562150955
• The cube root of 21099840 is 276.3289503601

Scales and comparisons

• 21,099,840 seconds is equal to 34 weeks, 6 days, 5 hours, 4 minutes.
• To count from 1 to 21,099,840 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 21099840 cubic inches would be around 23 feet tall.

Recreational maths with 21099840

• 21099840 backwards is 04899012
• The number of decimal digits it has is: 8
• The sum of 21099840's digits is 33
• More coming soon!