# 16921

## 16,921 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 16921 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

16921 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 16921:

### 16921

See below for interesting mathematical facts about the number 16921 from the Numbermatics database.

### Names of 16921

• Cardinal: 16921 can be written as Sixteen thousand, nine hundred twenty-one.

### Scientific notation

• Scientific notation: 1.6921 × 104

### Factors of 16921

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 16921

### Divisors of 16921

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 16922
• Sum of proper divisors (its aliquot sum) s(n): 1
• 16921 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 16920

### Bases of 16921

• Binary: 1000010000110012
• Base-36: D21

### Squares and roots of 16921

• 16921 squared (169212) is 286320241
• 16921 cubed (169213) is 4844824797961
• The square root of 16921 is 130.0807441553
• The cube root of 16921 is 25.6729243937

### Scales and comparisons

How big is 16921?
• 16,921 seconds is equal to 4 hours, 42 minutes, 1 second.
• To count from 1 to 16,921 would take you about four 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 16921 cubic inches would be around 2.1 feet tall.

### Recreational maths with 16921

• 16921 backwards is 12961
• The number of decimal digits it has is: 5
• The sum of 16921's digits is 19
• More coming soon!