# 1921

## 1,921 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1921 look like?

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

1921 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 1921:

### 17 × 113

See below for interesting mathematical facts about the number 1921 from the Numbermatics database.

### Names of 1921

• Cardinal: 1921 can be written as One thousand, nine hundred twenty-one.

### Scientific notation

• Scientific notation: 1.921 × 103

### Factors of 1921

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 130

### Divisors of 1921

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 2052
• Sum of proper divisors (its aliquot sum) s(n): 131
• 1921 is a deficient number, because the sum of its proper divisors (131) is less than itself. Its deficiency is 1790

### Bases of 1921

• Binary: 111100000012
• Base-36: 1HD

### Squares and roots of 1921

• 1921 squared (19212) is 3690241
• 1921 cubed (19213) is 7088952961
• The square root of 1921 is 43.8292140017
• The cube root of 1921 is 12.4310874497

### Scales and comparisons

How big is 1921?
• 1,921 seconds is equal to 32 minutes, 1 second.
• To count from 1 to 1,921 would take you about thirty-two minutes.

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 1921 cubic inches would be around 1 feet tall.

### Recreational maths with 1921

• 1921 backwards is 1291
• The number of decimal digits it has is: 4
• The sum of 1921's digits is 13
• More coming soon!

MLA style:
"Number 1921 - Facts about the integer". Numbermatics.com. 2021. Web. 9 December 2021.

APA style:
Numbermatics. (2021). Number 1921 - Facts about the integer. Retrieved 9 December 2021, from https://numbermatics.com/n/1921/

Chicago style:
Numbermatics. 2021. "Number 1921 - Facts about the integer". https://numbermatics.com/n/1921/

The information we have on file for 1921 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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