3,121 in words
3,121
three thousand one hundred twenty-one
3,121 is written three thousand one hundred twenty-one.
Ways to write it
- As an ordinal
- three thousand one hundred twenty-first
- Roman numeral
- MMMCXXI
- Expanded form
- 3,000 + 100 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| thousands | 3 | 3,000 |
| hundreds | 1 | 100 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 3,121 (2 factors)
- First 10 multiples
- 3,121, 6,242, 9,363, 12,484, 15,605, 18,726, 21,847, 24,968, 28,089, 31,210
- Square
- 3,121 × 3,121 = 9,740,641
- Square root
- ≈ 55.87
- Sum of the digits
- 3 + 1 + 2 + 1 = 7
- Rounded to the nearest 10
- 3,120
- Rounded to the nearest 100
- 3,100
- Rounded to the nearest 1000
- 3,000
- Number before
- 3,120
- Number after
- 3,122
- In binary
110000110001
Quick check
What number comes just after 3,121?
Show the answer
3,122
Is 3,121 even or odd?
Show the answer
Odd
What is 3,121 + 10?
Show the answer
3,131
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 3,121 in words?
3,121 is written "three thousand one hundred twenty-one".
Is 3,121 a prime number?
Yes. 3,121 is a prime number: its only factors are 1 and 3,121.
What are the factors of 3,121?
The factors of 3,121 are 1 and 3,121.
How do you write 3,121 in Roman numerals?
3,121 in Roman numerals is MMMCXXI.