# 21768

## 21,768 is an even composite number composed of three prime numbers multiplied together.

What does the number 21768 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 16 divisors.

21768 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of sixteen divisors.

## Prime factorization of 21768:

### 23 × 3 × 907

(2 × 2 × 2 × 3 × 907)

See below for interesting mathematical facts about the number 21768 from the Numbermatics database.

### Names of 21768

• Cardinal: 21768 can be written as Twenty-one thousand, seven hundred sixty-eight.

### Scientific notation

• Scientific notation: 2.1768 × 104

### Factors of 21768

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 912

### Divisors of 21768

• Number of divisors d(n): 16
• Complete list of divisors:
• Sum of all divisors σ(n): 54480
• Sum of proper divisors (its aliquot sum) s(n): 32712
• 21768 is an abundant number, because the sum of its proper divisors (32712) is greater than itself. Its abundance is 10944

### Bases of 21768

• Binary: 1010101000010002
• Base-36: GSO

### Squares and roots of 21768

• 21768 squared (217682) is 473845824
• 21768 cubed (217683) is 10314675896832
• The square root of 21768 is 147.5398251321
• The cube root of 21768 is 27.9215491075

### Scales and comparisons

How big is 21768?
• 21,768 seconds is equal to 6 hours, 2 minutes, 48 seconds.
• To count from 1 to 21,768 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 21768 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21768

• 21768 backwards is 86712
• 21768 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 21768's digits is 24
• More coming soon!