821 in Roman Numerals
DCCCXXI
821 in Roman numerals is DCCCXXI, and is spelled eight hundred twenty-one.
How to write 821 in Roman numerals
To write 821 in Roman numerals, combine DCCC (800), XX (20) and I (1) to get DCCCXXI.
The numeral DCCCXXI is read from left to right, from the largest value to the smallest, adding each symbol as you go.
| Value | Roman |
|---|---|
| 800 | DCCC |
| 20 | XX |
| 1 | I |
| 821 | DCCCXXI |
Facts about the number 821
- 821 is an odd number.
- 821 is a prime number: it has no divisors other than 1 and itself.
- The digits of 821 add up to 11.
- 821 has 2 divisors.
821 in other number systems
| Decimal | 821 |
| Roman | DCCCXXI |
| Binary | 1100110101 |
| Octal | 1465 |
| Hexadecimal | 335 |
Frequently asked questions
How do you write 821 in Roman numerals?
821 is written as DCCCXXI in Roman numerals.
What does the Roman numeral DCCCXXI mean?
DCCCXXI represents the number 821 (eight hundred twenty-one).
Is 821 a prime number?
Yes, 821 is a prime number.
What is 821 in binary and hexadecimal?
821 is 1100110101 in binary and 335 in hexadecimal.
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