321
The Airbus A321 is the stretched A320 and now outsells the aircraft it was stretched from.
- Odd
- Composite
Where 321 fits
Why 321 is special
Its long-range variant can cross the Atlantic, which lets airlines fly thin routes that could not fill a widebody — the gap the Boeing 757 used to occupy.
Factors & digit properties
- Divisors (4)
- 1, 3, 107, 321
- Prime factorisation
- 3 × 107
- Digit sum
- 6
- Digital root
- 6
Representations
- Decimal
- 321
- Binary
- 101000001
- Octal
- 501
- Hexadecimal
- 141
- Roman numeral
- CCCXXI
- Scientific notation
- 3.210 × 10^2
Other mathematical patterns
- Deficient number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
The A321 is the stretched A320 and now outsells it, because its long-range variants fly thin transatlantic routes that cannot fill a widebody.
View 320 →Other connections
- contrasts with320
why?
Strength 0.50, confidence "high".
Technology & computing
The A321LR and XLR fly transatlantic routes too thin for a widebody, which is the role the 757 held until production ended in 2004. The gap stayed open for roughly fifteen years.
DocumentedTechnology & computing
Common questions
Is 321 a prime number?
No, 321 is not prime.
What are the factors of 321?
The factors of 321 are 1, 3, 107, 321.
What is 321 in Roman numerals?
321 in Roman numerals is CCCXXI.
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