# 21000

## 21,000 is an even composite number composed of four prime numbers multiplied together.

What does the number 21000 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 64 divisors.

21000 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixty-four divisors.

## Prime factorization of 21000:

### 23 × 3 × 53 × 7

(2 × 2 × 2 × 3 × 5 × 5 × 5 × 7)

See below for interesting mathematical facts about the number 21000 from the Numbermatics database.

### Names of 21000

• Cardinal: 21000 can be written as Twenty-one thousand.

### Scientific notation

• Scientific notation: 2.1 × 104

### Factors of 21000

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 17

### Divisors of 21000

• Number of divisors d(n): 64
• Complete list of divisors:
• Sum of all divisors σ(n): 74880
• Sum of proper divisors (its aliquot sum) s(n): 53880
• 21000 is an abundant number, because the sum of its proper divisors (53880) is greater than itself. Its abundance is 32880

### Bases of 21000

• Binary: 1010010000010002
• Hexadecimal: 0x5208
• Base-36: G7C

### Squares and roots of 21000

• 21000 squared (210002) is 441000000
• 21000 cubed (210003) is 9261000000000
• The square root of 21000 is 144.9137674619
• The cube root of 21000 is 27.5892417639

### Scales and comparisons

How big is 21000?
• 21,000 seconds is equal to 5 hours, 50 minutes.
• To count from 1 to 21,000 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 21000 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21000

• 21000 backwards is 00012
• 21000 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 21000's digits is 3
• More coming soon!

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The information we have on file for 21000 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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