# 21689

## 21,689 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21689 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

21689 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

## Prime factorization of 21689:

### 232 × 41

(23 × 23 × 41)

See below for interesting mathematical facts about the number 21689 from the Numbermatics database.

### Names of 21689

• Cardinal: 21689 can be written as Twenty-one thousand, six hundred eighty-nine.

### Scientific notation

• Scientific notation: 2.1689 × 104

### Factors of 21689

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 64

### Divisors of 21689

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 23226
• Sum of proper divisors (its aliquot sum) s(n): 1537
• 21689 is a deficient number, because the sum of its proper divisors (1537) is less than itself. Its deficiency is 20152

### Bases of 21689

• Binary: 1010100101110012
• Base-36: GQH

### Squares and roots of 21689

• 21689 squared (216892) is 470412721
• 21689 cubed (216893) is 10202781505769
• The square root of 21689 is 147.2718574609
• The cube root of 21689 is 27.8877307169

### Scales and comparisons

How big is 21689?
• 21,689 seconds is equal to 6 hours, 1 minute, 29 seconds.
• To count from 1 to 21,689 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 21689 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21689

• 21689 backwards is 98612
• The number of decimal digits it has is: 5
• The sum of 21689's digits is 26
• More coming soon!