# 21730

## 21,730 is an even composite number composed of four prime numbers multiplied together.

What does the number 21730 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 16 divisors.

21730 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixteen divisors.

## Prime factorization of 21730:

### 2 × 5 × 41 × 53

See below for interesting mathematical facts about the number 21730 from the Numbermatics database.

### Names of 21730

• Cardinal: 21730 can be written as Twenty-one thousand, seven hundred thirty.

### Scientific notation

• Scientific notation: 2.173 × 104

### Factors of 21730

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 101

### Divisors of 21730

• Number of divisors d(n): 16
• Complete list of divisors:
• Sum of all divisors σ(n): 40824
• Sum of proper divisors (its aliquot sum) s(n): 19094
• 21730 is a deficient number, because the sum of its proper divisors (19094) is less than itself. Its deficiency is 2636

### Bases of 21730

• Binary: 1010100111000102
• Base-36: GRM

### Squares and roots of 21730

• 21730 squared (217302) is 472192900
• 21730 cubed (217303) is 10260751717000
• The square root of 21730 is 147.4109900923
• The cube root of 21730 is 27.9052922649

### Scales and comparisons

How big is 21730?
• 21,730 seconds is equal to 6 hours, 2 minutes, 10 seconds.
• To count from 1 to 21,730 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 21730 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21730

• 21730 backwards is 03712
• The number of decimal digits it has is: 5
• The sum of 21730's digits is 13
• More coming soon!