# 2021

## 2,021 is an odd composite number composed of two prime numbers multiplied together.

What does the number 2021 look like?

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

2021 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 2021:

### 43 × 47

See below for interesting mathematical facts about the number 2021 from the Numbermatics database.

### Names of 2021

• Cardinal: 2021 can be written as Two thousand and twenty-one.

### Scientific notation

• Scientific notation: 2.021 × 103

### Factors of 2021

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 90

### Divisors of 2021

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 2112
• Sum of proper divisors (its aliquot sum) s(n): 91
• 2021 is a deficient number, because the sum of its proper divisors (91) is less than itself. Its deficiency is 1930

### Bases of 2021

• Binary: 111111001012
• Base-36: 1K5

### Squares and roots of 2021

• 2021 squared (20212) is 4084441
• 2021 cubed (20213) is 8254655261
• The square root of 2021 is 44.9555335859
• The cube root of 2021 is 12.6431542893

### Scales and comparisons

How big is 2021?
• 2,021 seconds is equal to 33 minutes, 41 seconds.
• To count from 1 to 2,021 would take you about thirty-three 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 2021 cubic inches would be around 1.1 feet tall.

### Recreational maths with 2021

• 2021 backwards is 1202
• The number of decimal digits it has is: 4
• The sum of 2021's digits is 5
• More coming soon!