1,221 in words
1,221
one thousand two hundred and twenty-one
1,221 is written one thousand two hundred and twenty-one.
Ways to write it
- As an ordinal
- one thousand two hundred and twenty-first
- Roman numeral
- MCCXXI
- Expanded form
- 1,000 + 200 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| thousands | 1 | 1,000 |
| hundreds | 2 | 200 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 11, 33, 37, 111, 407 and 1,221 (8 factors)
- First 10 multiples
- 1,221, 2,442, 3,663, 4,884, 6,105, 7,326, 8,547, 9,768, 10,989, 12,210
- Square
- 1,221 × 1,221 = 1,490,841
- Square root
- ≈ 34.94
- Sum of the digits
- 1 + 2 + 2 + 1 = 6
- Rounded to the nearest 10
- 1,220
- Rounded to the nearest 100
- 1,200
- Rounded to the nearest 1000
- 1,000
- Number before
- 1,220
- Number after
- 1,222
- In binary
10011000101
Quick check
What number comes just after 1,221?
Show the answer
1,222
Is 1,221 even or odd?
Show the answer
Odd
What is 1,221 + 10?
Show the answer
1,231
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 1,221 in words?
1,221 is written "one thousand two hundred and twenty-one".
Is 1,221 a prime number?
No. 1,221 is a composite number, because it has more than two factors.
What are the factors of 1,221?
The factors of 1,221 are 1, 3, 11, 33, 37, 111, 407 and 1,221.
How do you write 1,221 in Roman numerals?
1,221 in Roman numerals is MCCXXI.