# 21971

## 21,971 is an odd composite number composed of two prime numbers multiplied together.

What does the number 21971 look like?

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

21971 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 21971:

### 127 × 173

See below for interesting mathematical facts about the number 21971 from the Numbermatics database.

### Names of 21971

• Cardinal: 21971 can be written as Twenty-one thousand, nine hundred seventy-one.

### Scientific notation

• Scientific notation: 2.1971 × 104

### Factors of 21971

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 300

### Divisors of 21971

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 22272
• Sum of proper divisors (its aliquot sum) s(n): 301
• 21971 is a deficient number, because the sum of its proper divisors (301) is less than itself. Its deficiency is 21670

### Bases of 21971

• Binary: 1010101110100112
• Base-36: GYB

### Squares and roots of 21971

• 21971 squared (219712) is 482724841
• 21971 cubed (219713) is 10605947481611
• The square root of 21971 is 148.2261785245
• The cube root of 21971 is 28.0080759017

### Scales and comparisons

How big is 21971?
• 21,971 seconds is equal to 6 hours, 6 minutes, 11 seconds.
• To count from 1 to 21,971 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 21971 cubic inches would be around 2.3 feet tall.

### Recreational maths with 21971

• 21971 backwards is 17912
• The number of decimal digits it has is: 5
• The sum of 21971's digits is 20
• More coming soon!