# 21975

## 21,975 is an odd composite number composed of three prime numbers multiplied together.

What does the number 21975 look like?

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

21975 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twelve divisors.

## Prime factorization of 21975:

### 3 × 52 × 293

(3 × 5 × 5 × 293)

See below for interesting mathematical facts about the number 21975 from the Numbermatics database.

### Names of 21975

• Cardinal: 21975 can be written as Twenty-one thousand, nine hundred seventy-five.

### Scientific notation

• Scientific notation: 2.1975 × 104

### Factors of 21975

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 4
• Sum of prime factors: 301

### Divisors of 21975

• Number of divisors d(n): 12
• Complete list of divisors:
• Sum of all divisors σ(n): 36456
• Sum of proper divisors (its aliquot sum) s(n): 14481
• 21975 is a deficient number, because the sum of its proper divisors (14481) is less than itself. Its deficiency is 7494

### Bases of 21975

• Binary: 1010101110101112
• Base-36: GYF

### Squares and roots of 21975

• 21975 squared (219752) is 482900625
• 21975 cubed (219753) is 10611741234375
• The square root of 21975 is 148.2396708039
• The cube root of 21975 is 28.0097754983

### Scales and comparisons

How big is 21975?
• 21,975 seconds is equal to 6 hours, 6 minutes, 15 seconds.
• To count from 1 to 21,975 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 21975 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21975

• 21975 backwards is 57912
• The number of decimal digits it has is: 5
• The sum of 21975's digits is 24
• More coming soon!