21040

Names of 21040

• Cardinal: 21040 can be written as Twenty-one thousand and forty.

Scientific notation

• Scientific notation: 2.104 × 10⁴

Factors of 21040

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 270

Divisors of 21040

• Number of divisors d(n): 20
• Complete list of divisors:
  1 2 4 5 8 10 16 20 40 80 263 526 1052 1315 2104 2630 4208 5260 10520 21040
• Sum of all divisors σ(n): 49104
• Sum of proper divisors (its aliquot sum) s(n): 28064
• 21040 is an abundant number, because the sum of its proper divisors (28064) is greater than itself. Its abundance is 7024

Bases of 21040

• Binary: 101001000110000₂
• Hexadecimal: 0x5230
• Base-36: G8G

Squares and roots of 21040

• 21040 squared (21040²) is 442681600
• 21040 cubed (21040³) is 9314020864000
• The square root of 21040 is 145.0517149159
• The cube root of 21040 is 27.6067476325

Scales and comparisons

• 21,040 seconds is equal to 5 hours, 50 minutes, 40 seconds.
• To count from 1 to 21,040 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 21040 cubic inches would be around 2.3 feet tall.

Recreational maths with 21040

• 21040 backwards is 04012
• The number of decimal digits it has is: 5
• The sum of 21040's digits is 7
• More coming soon!