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:
1 43 47 2021
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
Hexadecimal: 0x7E5
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!

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The information we have on file for 2021 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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