# 21609

## 21,609 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21609 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 15 divisors.

21609 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of fifteen divisors.

## Prime factorization of 21609:

### 32 × 74

(3 × 3 × 7 × 7 × 7 × 7)

See below for interesting mathematical facts about the number 21609 from the Numbermatics database.

### Names of 21609

• Cardinal: 21609 can be written as Twenty-one thousand, six hundred nine.

### Scientific notation

• Scientific notation: 2.1609 × 104

### Factors of 21609

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 10

### Divisors of 21609

• Number of divisors d(n): 15
• Complete list of divisors:
• Sum of all divisors σ(n): 36413
• Sum of proper divisors (its aliquot sum) s(n): 14804
• 21609 is a deficient number, because the sum of its proper divisors (14804) is less than itself. Its deficiency is 6805

### Bases of 21609

• Binary: 1010100011010012
• Base-36: GO9

### Squares and roots of 21609

• 21609 squared (216092) is 466948881
• 21609 cubed (216093) is 10090298369529
• 21609 is a perfect square number. Its square root is 147
• The cube root of 21609 is 27.8534004553

### Scales and comparisons

How big is 21609?
• 21,609 seconds is equal to 6 hours, 9 seconds.
• To count from 1 to 21,609 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 21609 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21609

• 21609 backwards is 90612
• The number of decimal digits it has is: 5
• The sum of 21609's digits is 18
• More coming soon!

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The information we have on file for 21609 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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