21000000

Names of 21000000

• Cardinal: 21000000 can be written as Twenty-one million.

Scientific notation

• Scientific notation: 2.1 × 10⁷

Factors of 21000000

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 14
• Sum of prime factors: 17

Divisors of 21000000

• Number of divisors d(n): 196
• Complete list of divisors:
  1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 25 28 30 32 35 40 42 48 50 56 60 64 70 75 80 84 96 100 105 112 120 125 140 150 160 168 175 192 200 210 224 240 250 280 300 320 336 350 375 400 420 448 480 500 525 560 600 625 672 700 750 800 840 875 960 1000 1050 1120 1200 1250 1344 1400 1500 1600 1680 1750 1875 2000 2100 2240 2400 2500 2625 2800 3000 3125 3360 3500 3750 4000 4200 4375 4800 5000 5250 5600 6000 6250 6720 7000 7500 8000 8400 8750 9375 10000 10500 11200 12000 12500 13125 14000 15000 15625 16800 17500 18750 20000 21000 21875 24000 25000 26250 28000 30000 31250 33600 35000 37500 40000 42000 43750 46875 50000 52500 56000 60000 62500 65625 70000 75000 84000 87500 93750 100000 105000 109375 120000 125000 131250 140000 150000 168000 175000 187500 200000 210000 218750 250000 262500 280000 300000 328125 350000 375000 420000 437500 500000 525000 600000 656250 700000 750000 840000 875000 1000000 1050000 1312500 1400000 1500000 1750000 2100000 2625000 3000000 3500000 4200000 5250000 7000000 10500000 21000000
• Sum of all divisors σ(n): 79373984
• Sum of proper divisors (its aliquot sum) s(n): 58373984
• 21000000 is an abundant number, because the sum of its proper divisors (58373984) is greater than itself. Its abundance is 37373984

Bases of 21000000

• Binary: 1010000000110111101000000₂
• Hexadecimal: 0x1406F40
• Base-36: CI3PC

Squares and roots of 21000000

• 21000000 squared (21000000²) is 441000000000000
• 21000000 cubed (21000000³) is 9261000000000000000000
• The square root of 21000000 is 4582.5756949557
• The cube root of 21000000 is 275.8924176381

Scales and comparisons

• 21,000,000 seconds is equal to 34 weeks, 5 days, 1 hour, 20 minutes.
• To count from 1 to 21,000,000 would take you about fourteen 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 21000000 cubic inches would be around 23 feet tall.

Recreational maths with 21000000

• 21000000 backwards is 00000012
• 21000000 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21000000's digits is 3
• More coming soon!