# 21455

## 21,455 is an odd composite number composed of three prime numbers multiplied together.

What does the number 21455 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

21455 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

## Prime factorization of 21455:

### 5 × 7 × 613

See below for interesting mathematical facts about the number 21455 from the Numbermatics database.

### Names of 21455

• Cardinal: 21455 can be written as Twenty-one thousand, four hundred fifty-five.

### Scientific notation

• Scientific notation: 2.1455 × 104

### Factors of 21455

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 625

### Divisors of 21455

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 29472
• Sum of proper divisors (its aliquot sum) s(n): 8017
• 21455 is a deficient number, because the sum of its proper divisors (8017) is less than itself. Its deficiency is 13438

### Bases of 21455

• Binary: 1010011110011112
• Base-36: GJZ

### Squares and roots of 21455

• 21455 squared (214552) is 460317025
• 21455 cubed (214553) is 9876101771375
• The square root of 21455 is 146.4752538827
• The cube root of 21455 is 27.7870754061

### Scales and comparisons

How big is 21455?
• 21,455 seconds is equal to 5 hours, 57 minutes, 35 seconds.
• To count from 1 to 21,455 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 21455 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21455

• 21455 backwards is 55412
• The number of decimal digits it has is: 5
• The sum of 21455's digits is 17
• More coming soon!