21382490

Names of 21382490

• Cardinal: 21382490 can be written as Twenty-one million, three hundred eighty-two thousand, four hundred ninety.

Scientific notation

• Scientific notation: 2.138249 × 10⁷

Factors of 21382490

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 2138256

Divisors of 21382490

• Number of divisors d(n): 8
• Complete list of divisors:
  1 2 5 10 2138249 4276498 10691245 21382490
• Sum of all divisors σ(n): 38488500
• Sum of proper divisors (its aliquot sum) s(n): 17106010
• 21382490 is a deficient number, because the sum of its proper divisors (17106010) is less than itself. Its deficiency is 4276480

Bases of 21382490

• Binary: 1010001100100010101011010₂
• Hexadecimal: 0x146455A
• Base-36: CQAU2

Squares and roots of 21382490

• 21382490 squared (21382490²) is 457210878600100
• 21382490 cubed (21382490³) is 9776307039557852249000
• The square root of 21382490 is 4624.1204569085
• The cube root of 21382490 is 277.5573671403

Scales and comparisons

• 21,382,490 seconds is equal to 35 weeks, 2 days, 11 hours, 34 minutes, 50 seconds.
• To count from 1 to 21,382,490 would take you about five 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 21382490 cubic inches would be around 23.1 feet tall.

Recreational maths with 21382490

• 21382490 backwards is 09428312
• The number of decimal digits it has is: 8
• The sum of 21382490's digits is 29
• More coming soon!