# 21731

## 21,731 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21731 look like?

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

21731 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 21731:

### 31 × 701

See below for interesting mathematical facts about the number 21731 from the Numbermatics database.

### Names of 21731

• Cardinal: 21731 can be written as Twenty-one thousand, seven hundred thirty-one.

### Scientific notation

• Scientific notation: 2.1731 × 104

### Factors of 21731

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 732

### Divisors of 21731

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 22464
• Sum of proper divisors (its aliquot sum) s(n): 733
• 21731 is a deficient number, because the sum of its proper divisors (733) is less than itself. Its deficiency is 20998

### Bases of 21731

• Binary: 1010100111000112
• Base-36: GRN

### Squares and roots of 21731

• 21731 squared (217312) is 472236361
• 21731 cubed (217313) is 10262168360891
• The square root of 21731 is 147.4143819305
• The cube root of 21731 is 27.9057203191

### Scales and comparisons

How big is 21731?
• 21,731 seconds is equal to 6 hours, 2 minutes, 11 seconds.
• To count from 1 to 21,731 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 21731 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21731

• 21731 backwards is 13712
• The number of decimal digits it has is: 5
• The sum of 21731's digits is 14
• More coming soon!