# 21392

## 21,392 is an even composite number composed of three prime numbers multiplied together.

What does the number 21392 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 20 divisors.

21392 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twenty divisors.

## Prime factorization of 21392:

### 24 × 7 × 191

(2 × 2 × 2 × 2 × 7 × 191)

See below for interesting mathematical facts about the number 21392 from the Numbermatics database.

### Names of 21392

• Cardinal: 21392 can be written as Twenty-one thousand, three hundred ninety-two.

### Scientific notation

• Scientific notation: 2.1392 × 104

### Factors of 21392

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 200

### Divisors of 21392

• Number of divisors d(n): 20
• Complete list of divisors:
• Sum of all divisors σ(n): 47616
• Sum of proper divisors (its aliquot sum) s(n): 26224
• 21392 is an abundant number, because the sum of its proper divisors (26224) is greater than itself. Its abundance is 4832

### Bases of 21392

• Binary: 1010011100100002
• Base-36: GI8

### Squares and roots of 21392

• 21392 squared (213922) is 457617664
• 21392 cubed (213923) is 9789357068288
• The square root of 21392 is 146.2600423903
• The cube root of 21392 is 27.7598509517

### Scales and comparisons

How big is 21392?
• 21,392 seconds is equal to 5 hours, 56 minutes, 32 seconds.
• To count from 1 to 21,392 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 21392 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21392

• 21392 backwards is 29312
• The number of decimal digits it has is: 5
• The sum of 21392's digits is 17
• More coming soon!