# 21845

## 21,845 is an odd composite number composed of three prime numbers multiplied together.

What does the number 21845 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

21845 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

## Prime factorization of 21845:

### 5 × 17 × 257

See below for interesting mathematical facts about the number 21845 from the Numbermatics database.

### Names of 21845

• Cardinal: 21845 can be written as Twenty-one thousand, eight hundred forty-five.

### Scientific notation

• Scientific notation: 2.1845 × 104

### Factors of 21845

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 279

### Divisors of 21845

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 27864
• Sum of proper divisors (its aliquot sum) s(n): 6019
• 21845 is a deficient number, because the sum of its proper divisors (6019) is less than itself. Its deficiency is 15826

### Bases of 21845

• Binary: 1010101010101012
• Base-36: GUT

### Squares and roots of 21845

• 21845 squared (218452) is 477204025
• 21845 cubed (218453) is 10424521926125
• The square root of 21845 is 147.8005412711
• The cube root of 21845 is 27.9544326867

### Scales and comparisons

How big is 21845?
• 21,845 seconds is equal to 6 hours, 4 minutes, 5 seconds.
• To count from 1 to 21,845 would take you about six 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 21845 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21845

• 21845 backwards is 54812
• The number of decimal digits it has is: 5
• The sum of 21845's digits is 20
• More coming soon!

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The information we have on file for 21845 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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