# 21396

## 21,396 is an even composite number composed of three prime numbers multiplied together.

What does the number 21396 look like?

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

21396 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 21396:

### 22 × 3 × 1783

(2 × 2 × 3 × 1783)

See below for interesting mathematical facts about the number 21396 from the Numbermatics database.

### Names of 21396

• Cardinal: 21396 can be written as Twenty-one thousand, three hundred ninety-six.

### Scientific notation

• Scientific notation: 2.1396 × 104

### Factors of 21396

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 1788

### Divisors of 21396

• Number of divisors d(n): 12
• Complete list of divisors:
• Sum of all divisors σ(n): 49952
• Sum of proper divisors (its aliquot sum) s(n): 28556
• 21396 is an abundant number, because the sum of its proper divisors (28556) is greater than itself. Its abundance is 7160

### Bases of 21396

• Binary: 1010011100101002
• Base-36: GIC

### Squares and roots of 21396

• 21396 squared (213962) is 457788816
• 21396 cubed (213963) is 9794849507136
• The square root of 21396 is 146.2737160259
• The cube root of 21396 is 27.7615810763

### Scales and comparisons

How big is 21396?
• 21,396 seconds is equal to 5 hours, 56 minutes, 36 seconds.
• To count from 1 to 21,396 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 21396 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21396

• 21396 backwards is 69312
• The number of decimal digits it has is: 5
• The sum of 21396's digits is 21
• More coming soon!