# 21308

## 21,308 is an even composite number composed of three prime numbers multiplied together.

What does the number 21308 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 12 divisors.

21308 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twelve divisors.

## Prime factorization of 21308:

### 22 × 7 × 761

(2 × 2 × 7 × 761)

See below for interesting mathematical facts about the number 21308 from the Numbermatics database.

### Names of 21308

• Cardinal: 21308 can be written as Twenty-one thousand, three hundred eight.

### Scientific notation

• Scientific notation: 2.1308 × 104

### Factors of 21308

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 770

### Divisors of 21308

• Number of divisors d(n): 12
• Complete list of divisors:
• Sum of all divisors σ(n): 42672
• Sum of proper divisors (its aliquot sum) s(n): 21364
• 21308 is an abundant number, because the sum of its proper divisors (21364) is greater than itself. Its abundance is 56

### Bases of 21308

• Binary: 1010011001111002
• Base-36: GFW

### Squares and roots of 21308

• 21308 squared (213082) is 454030864
• 21308 cubed (213083) is 9674489650112
• The square root of 21308 is 145.9726001687
• The cube root of 21308 is 27.7234684055

### Scales and comparisons

How big is 21308?
• 21,308 seconds is equal to 5 hours, 55 minutes, 8 seconds.
• To count from 1 to 21,308 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 21308 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21308

• 21308 backwards is 80312
• 21308 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 21308's digits is 14
• More coming soon!