21445

Names of 21445

• Cardinal: 21445 can be written as Twenty-one thousand, four hundred forty-five.

Scientific notation

• Scientific notation: 2.1445 × 10⁴

Factors of 21445

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 4294

Divisors of 21445

• Number of divisors d(n): 4
• Complete list of divisors:
  1 5 4289 21445
• Sum of all divisors σ(n): 25740
• Sum of proper divisors (its aliquot sum) s(n): 4295
• 21445 is a deficient number, because the sum of its proper divisors (4295) is less than itself. Its deficiency is 17150

Bases of 21445

• Binary: 101001111000101₂
• Hexadecimal: 0x53C5
• Base-36: GJP

Squares and roots of 21445

• 21445 squared (21445²) is 459888025
• 21445 cubed (21445³) is 9862298696125
• The square root of 21445 is 146.4411144453
• The cube root of 21445 is 27.7827576257

Scales and comparisons

• 21,445 seconds is equal to 5 hours, 57 minutes, 25 seconds.
• To count from 1 to 21,445 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 21445 cubic inches would be around 2.3 feet tall.

Recreational maths with 21445

• 21445 backwards is 54412
• The number of decimal digits it has is: 5
• The sum of 21445's digits is 16
• More coming soon!