# 21289

## 21,289 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21289 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

21289 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 21289:

### 61 × 349

See below for interesting mathematical facts about the number 21289 from the Numbermatics database.

### Names of 21289

• Cardinal: 21289 can be written as Twenty-one thousand, two hundred eighty-nine.

### Scientific notation

• Scientific notation: 2.1289 × 104

### Factors of 21289

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 410

### Divisors of 21289

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 21700
• Sum of proper divisors (its aliquot sum) s(n): 411
• 21289 is a deficient number, because the sum of its proper divisors (411) is less than itself. Its deficiency is 20878

### Bases of 21289

• Binary: 1010011001010012
• Base-36: GFD

### Squares and roots of 21289

• 21289 squared (212892) is 453221521
• 21289 cubed (212893) is 9648632960569
• The square root of 21289 is 145.9075049475
• The cube root of 21289 is 27.7152257651

### Scales and comparisons

How big is 21289?
• 21,289 seconds is equal to 5 hours, 54 minutes, 49 seconds.
• To count from 1 to 21,289 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 21289 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21289

• 21289 backwards is 98212
• The number of decimal digits it has is: 5
• The sum of 21289's digits is 22
• More coming soon!