# 21125

## 21,125 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21125 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 12 divisors.

21125 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of twelve divisors.

## Prime factorization of 21125:

### 53 × 132

(5 × 5 × 5 × 13 × 13)

See below for interesting mathematical facts about the number 21125 from the Numbermatics database.

### Names of 21125

• Cardinal: 21125 can be written as Twenty-one thousand, one hundred twenty-five.

### Scientific notation

• Scientific notation: 2.1125 × 104

### Factors of 21125

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 18

### Divisors of 21125

• Number of divisors d(n): 12
• Complete list of divisors:
• Sum of all divisors σ(n): 28548
• Sum of proper divisors (its aliquot sum) s(n): 7423
• 21125 is a deficient number, because the sum of its proper divisors (7423) is less than itself. Its deficiency is 13702

### Bases of 21125

• Binary: 1010010100001012
• Base-36: GAT

### Squares and roots of 21125

• 21125 squared (211252) is 446265625
• 21125 cubed (211253) is 9427361328125
• The square root of 21125 is 145.3444185375
• The cube root of 21125 is 27.6438740683

### Scales and comparisons

How big is 21125?
• 21,125 seconds is equal to 5 hours, 52 minutes, 5 seconds.
• To count from 1 to 21,125 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 21125 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21125

• 21125 backwards is 52112
• The number of decimal digits it has is: 5
• The sum of 21125's digits is 11
• More coming soon!

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