2021
2021 is the year the James Webb Space Telescope launched.
- Odd
- Composite
Where 2021 fits
Why 2021 is special
It launched on Christmas Day after roughly twenty-five years of development and repeated delays, and had to unfold itself through hundreds of single-point-of-failure steps with no possibility of repair. All of them worked.
Factors & digit properties
- Divisors (4)
- 1, 43, 47, 2021
- Prime factorisation
- 43 × 47
- Digit sum
- 5
- Digital root
- 5
Representations
- Decimal
- 2021
- Binary
- 11111100101
- Octal
- 3745
- Hexadecimal
- 7e5
- Roman numeral
- MMXXI
- Scientific notation
- 2.021 × 10^3
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Hubble launched in 1990 and Webb in 2021. Webb observes in the infrared and had to unfold itself after launch with no possibility of the repair missions Hubble depended on.
View 1990 →Other connections
- developed from1990
why?
Strength 0.50, confidence "high".
Science
The James Webb Space Telescope launched on Christmas Day 2021 after around twenty-five years of development, then unfolded itself through hundreds of steps with no possibility of repair and no redundancy for most of them. Every one succeeded.
DocumentedSciencePeriod: 25 December 2021
Common questions
Is 2021 a prime number?
No, 2021 is not prime.
What are the factors of 2021?
The factors of 2021 are 1, 43, 47, 2021.
What is 2021 in Roman numerals?
2021 in Roman numerals is MMXXI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026