121 in words
121
one hundred twenty-one
121 is written one hundred twenty-one.
Ways to write it
- As an ordinal
- one hundred twenty-first
- Roman numeral
- CXXI
- Expanded form
- 100 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundreds | 1 | 100 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 11 and 121 (3 factors)
- First 10 multiples
- 121, 242, 363, 484, 605, 726, 847, 968, 1,089, 1,210
- Square
- 121 × 121 = 14,641
- Square root
- 11
- Sum of the digits
- 1 + 2 + 1 = 4
- Rounded to the nearest 10
- 120
- Rounded to the nearest 100
- 100
- Number before
- 120
- Number after
- 122
- In binary
1111001
Quick check
What number comes just after 121?
Show the answer
122
Is 121 even or odd?
Show the answer
Odd
What is 121 + 10?
Show the answer
131
Practice with a game
Times Tables Challenge
Practice any times table from 2× to 12×.
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.Frequently asked questions
How do you write 121 in words?
121 is written "one hundred twenty-one".
Is 121 a prime number?
No. 121 is a composite number, because it has more than two factors.
What are the factors of 121?
The factors of 121 are 1, 11 and 121.
How do you write 121 in Roman numerals?
121 in Roman numerals is CXXI.