621
621 BC is the year of Draco's law code in Athens.
- Odd
- Composite
Where 621 fits
Why 621 is special
The penalties were so severe that the word draconian derives from his name. A later reformer replaced almost all of them, keeping only the homicide provisions.
Same number, different meanings
How 621 is understood across different contexts — never implying one meaning because of another.
- Mathematics
The penalties were so severe that the word draconian derives from his name. A later reformer replaced almost all of them, keeping only the homicide provisions.
- Everyday life
E621 monosodium glutamate has been the subject of controlled trials that have not reproduced the symptom cluster attributed to it. Glutamate occurs naturally in tomatoes, cheese and seaweed.
- Law & regulation
Draco's code of 621 BC prescribed death for a very wide range of offences and gave English the word draconian. Solon repealed nearly all of it within thirty years, retaining only the homicide law.
621 is part of
Factors & digit properties
- Divisors (8)
- 1, 3, 9, 23, 27, 69, 207, 621
- Prime factorisation
- 3^3 × 23
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 621
- Binary
- 1001101101
- Octal
- 1155
- Hexadecimal
- 26d
- Roman numeral
- DCXXI
- Scientific notation
- 6.210 × 10^2
Other mathematical patterns
- Deficient number
- Harshad (Niven) number
- Lucky number (mathematical sieve)
Related numbers & connections
Disodium guanylate is used with glutamate because the pair is far more effective than either alone.
View 627 →Draco's code of 621 BC prescribed death for most offences; Solon repealed nearly all of it within thirty years, keeping only the homicide law.
View 594 →Everyday life
E621 monosodium glutamate has been the subject of controlled trials that have not reproduced the symptom cluster attributed to it. Glutamate occurs naturally in tomatoes, cheese and seaweed.
DocumentedEveryday lifeGeography: European Union and states adopting the E number systemPeriod: 1962–MSG's association with adverse effects derives largely from a 1968 letter and subsequent press coverage. Double-blind studies have repeatedly failed to reproduce the effect, and glutamate is abundant in ordinary foods.
DocumentedEveryday lifeGeography: European Union and United Kingdom
Law & regulation
Draco's code of 621 BC prescribed death for a very wide range of offences and gave English the word draconian. Solon repealed nearly all of it within thirty years, retaining only the homicide law.
DocumentedLaw & regulationGeography: AthensPeriod: 621 BC
Common questions
Is 621 a prime number?
No, 621 is not prime.
What are the factors of 621?
The factors of 621 are 1, 3, 9, 23, 27, 69, 207, 621.
What is 621 in Roman numerals?
621 in Roman numerals is DCXXI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 3 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 3 August 2026