# 21013

## 21,013 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 21013 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

21013 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 21013:

### 21013

See below for interesting mathematical facts about the number 21013 from the Numbermatics database.

### Names of 21013

• Cardinal: 21013 can be written as Twenty-one thousand and thirteen.

### Scientific notation

• Scientific notation: 2.1013 × 104

### Factors of 21013

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 21013

### Divisors of 21013

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 21014
• Sum of proper divisors (its aliquot sum) s(n): 1
• 21013 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 21012

### Bases of 21013

• Binary: 1010010000101012
• Base-36: G7P

### Squares and roots of 21013

• 21013 squared (210132) is 441546169
• 21013 cubed (210133) is 9278209649197
• The square root of 21013 is 144.9586147837
• The cube root of 21013 is 27.5949336077

### Scales and comparisons

How big is 21013?
• 21,013 seconds is equal to 5 hours, 50 minutes, 13 seconds.
• To count from 1 to 21,013 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 21013 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21013

• 21013 backwards is 31012
• The number of decimal digits it has is: 5
• The sum of 21013's digits is 7
• More coming soon!

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The information we have on file for 21013 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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