# 21819

## 21,819 is an odd composite number composed of three prime numbers multiplied together.

What does the number 21819 look like?

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

21819 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 21819:

### 3 × 7 × 1039

See below for interesting mathematical facts about the number 21819 from the Numbermatics database.

### Names of 21819

• Cardinal: 21819 can be written as Twenty-one thousand, eight hundred nineteen.

### Scientific notation

• Scientific notation: 2.1819 × 104

### Factors of 21819

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 1049

### Divisors of 21819

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 33280
• Sum of proper divisors (its aliquot sum) s(n): 11461
• 21819 is a deficient number, because the sum of its proper divisors (11461) is less than itself. Its deficiency is 10358

### Bases of 21819

• Binary: 1010101001110112
• Base-36: GU3

### Squares and roots of 21819

• 21819 squared (218192) is 476068761
• 21819 cubed (218193) is 10387344296259
• The square root of 21819 is 147.7125587077
• The cube root of 21819 is 27.9433377939

### Scales and comparisons

How big is 21819?
• 21,819 seconds is equal to 6 hours, 3 minutes, 39 seconds.
• To count from 1 to 21,819 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 21819 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21819

• 21819 backwards is 91812
• 21819 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 21819's digits is 21
• More coming soon!