221 in words
221
two hundred twenty-one
221 is written two hundred twenty-one.
Ways to write it
- As an ordinal
- two hundred twenty-first
- Roman numeral
- CCXXI
- Expanded form
- 200 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 2 | 200 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 13, 17 and 221 (4 factors)
- First 10 multiples
- 221, 442, 663, 884, 1,105, 1,326, 1,547, 1,768, 1,989, 2,210
- Square
- 221 × 221 = 48,841
- Square root
- ≈ 14.87
- Sum of the digits
- 2 + 2 + 1 = 5
- Rounded to the nearest 10
- 220
- Rounded to the nearest 100
- 200
- Number before
- 220
- Number after
- 222
- In binary
11011101
Quick check
What number comes just after 221?
Show the answer
222
Is 221 even or odd?
Show the answer
Odd
What is 221 + 10?
Show the answer
231
Practise with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Roman Numerals
Read and write Roman numerals from I to 3,999.Frequently asked questions
How do you write 221 in words?
221 is written "two hundred twenty-one".
Is 221 a prime number?
No. 221 is a composite number, because it has more than two factors.
What are the factors of 221?
The factors of 221 are 1, 13, 17 and 221.
How do you write 221 in Roman numerals?
221 in Roman numerals is CCXXI.