# 21151

## 21,151 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21151 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

21151 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 21151:

### 13 × 1627

See below for interesting mathematical facts about the number 21151 from the Numbermatics database.

### Names of 21151

• Cardinal: 21151 can be written as Twenty-one thousand, one hundred fifty-one.

### Scientific notation

• Scientific notation: 2.1151 × 104

### Factors of 21151

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 1640

### Divisors of 21151

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 22792
• Sum of proper divisors (its aliquot sum) s(n): 1641
• 21151 is a deficient number, because the sum of its proper divisors (1641) is less than itself. Its deficiency is 19510

### Bases of 21151

• Binary: 1010010100111112
• Base-36: GBJ

### Squares and roots of 21151

• 21151 squared (211512) is 447364801
• 21151 cubed (211513) is 9462212905951
• The square root of 21151 is 145.4338337527
• The cube root of 21151 is 27.6552104953

### Scales and comparisons

How big is 21151?
• 21,151 seconds is equal to 5 hours, 52 minutes, 31 seconds.
• To count from 1 to 21,151 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 21151 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21151

• 21151 backwards is 15112
• The number of decimal digits it has is: 5
• The sum of 21151's digits is 10
• More coming soon!

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The information we have on file for 21151 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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