odd, composite · 321st positive integer
The number 321
321 is an odd composite number. It is the 321st positive integer.
Quick reference
| Prime factorization | 3 × 107 |
| Divisors | 1, 3, 107, 321 |
| Binary | 101000001 |
| Hexadecimal | 0x141 |
| Roman numeral | CCCXXI |
| Digit sum | 6 |
| Properties | odd, composite |
Reading 321 in NumGrid context
321 is one of the data points covered by this site’s integer properties and number-guessing puzzles dataset. The detail above comes directly from classical number theory plus NumGrid solver-derived puzzle statistics; the context that follows situates the headline numbers against the broader distribution across positive integers within the NumGrid target pool.
Every number on this page links back to classical number theory plus NumGrid solver-derived puzzle statistics; the methodology page describes the inputs, refresh cadence, and known limitations of the underlying data product.
Practical use of this page is in combination with the comparison and ranking pages elsewhere on the site, which surface the same data for 321’s peers within positive integers within the NumGrid target pool. A single-entity reading without peer context can be misleading when an entity is an outlier on one axis but typical on another.
Frequently asked
Is 321 a prime number?
No. 321 is composite. Its prime factorization is 3 × 107.
What are the factors of 321?
The factors (divisors) of 321 are 1, 3, 107, 321.
What is 321 in binary?
321 in binary is 101000001. In hexadecimal it's 141.
What is 321 as a Roman numeral?
321 in Roman numerals is CCCXXI.
What's the digit sum of 321?
Adding the digits of 321: 3 + 2 + 1 = 6.