1421
1421 is the year Beijing became the capital of China.
- Odd
- Composite
Where 1421 fits
Why 1421 is special
The Yongle Emperor moved the capital north and built the Forbidden City, which took a million workers and remained the imperial seat for five centuries.
Factors & digit properties
- Divisors (6)
- 1, 7, 29, 49, 203, 1421
- Prime factorisation
- 7^2 × 29
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 1421
- Binary
- 10110001101
- Octal
- 2615
- Hexadecimal
- 58d
- Roman numeral
- MCDXXI
- Scientific notation
- 1.421 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
Beijing became the capital in 1421 under the same emperor who sent Zheng He's treasure voyages from 1405. Both were assertions of Ming reach, and both were reversed by later policy.
View 1405 →Other connections
- is associated with1405
why?
Strength 0.50, confidence "high".
History
Yongle relocated the Chinese capital to Beijing in 1421 and constructed the Forbidden City for it. The complex served as the imperial seat until 1912.
DocumentedHistoryGeography: ChinaPeriod: 1421
Common questions
Is 1421 a prime number?
No, 1421 is not prime.
What are the factors of 1421?
The factors of 1421 are 1, 7, 29, 49, 203, 1421.
What is 1421 in Roman numerals?
1421 in Roman numerals is MCDXXI.
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