18,121 in words
18,121
eighteen thousand one hundred twenty-one
18,121 is written eighteen thousand one hundred twenty-one.
Ways to write it
- As an ordinal
- eighteen thousand one hundred twenty-first
- Expanded form
- 10,000 + 8,000 + 100 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 1 | 10,000 |
| thousands | 8 | 8,000 |
| hundreds | 1 | 100 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 18,121 (2 factors)
- First 10 multiples
- 18,121, 36,242, 54,363, 72,484, 90,605, 108,726, 126,847, 144,968, 163,089, 181,210
- Square
- 18,121 × 18,121 = 328,370,641
- Square root
- ≈ 134.61
- Sum of the digits
- 1 + 8 + 1 + 2 + 1 = 13
- Rounded to the nearest 10
- 18,120
- Rounded to the nearest 100
- 18,100
- Rounded to the nearest 1000
- 18,000
- Number before
- 18,120
- Number after
- 18,122
- In binary
100011011001001
Quick check
What number comes just after 18,121?
Show the answer
18,122
Is 18,121 even or odd?
Show the answer
Odd
What is 18,121 + 10?
Show the answer
18,131
Practice with a game
Factors, Multiples & Primes
Multiples, factors, prime numbers, square numbers and prime factors.
Number Patterns
Find the missing number in a sequence.Frequently asked questions
How do you write 18,121 in words?
18,121 is written "eighteen thousand one hundred twenty-one".
Is 18,121 a prime number?
Yes. 18,121 is a prime number: its only factors are 1 and 18,121.
What are the factors of 18,121?
The factors of 18,121 are 1 and 18,121.