121,821 in words
121,821
one hundred and twenty-one thousand eight hundred and twenty-one
121,821 is written one hundred and twenty-one thousand eight hundred and twenty-one.
Ways to write it
- As an ordinal
- one hundred and twenty-one thousand eight hundred and twenty-first
- Expanded form
- 100,000 + 20,000 + 1,000 + 800 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundred thousands | 1 | 100,000 |
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 8 | 800 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 7, 21, 5,801, 17,403, 40,607 and 121,821 (8 factors)
- First 10 multiples
- 121,821, 243,642, 365,463, 487,284, 609,105, 730,926, 852,747, 974,568, 1,096,389, 1,218,210
- Square
- 121,821 × 121,821 = 14,840,356,041
- Square root
- ≈ 349.03
- Sum of the digits
- 1 + 2 + 1 + 8 + 2 + 1 = 15
- Rounded to the nearest 10
- 121,820
- Rounded to the nearest 100
- 121,800
- Rounded to the nearest 1000
- 122,000
- Number before
- 121,820
- Number after
- 121,822
- In binary
11101101111011101
Quick check
What number comes just after 121,821?
Show the answer
121,822
Is 121,821 even or odd?
Show the answer
Odd
What is 121,821 + 10?
Show the answer
121,831
Practise 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 121,821 in words?
121,821 is written "one hundred and twenty-one thousand eight hundred and twenty-one".
Is 121,821 a prime number?
No. 121,821 is a composite number, because it has more than two factors.
What are the factors of 121,821?
The factors of 121,821 are 1, 3, 7, 21, 5,801, 17,403, 40,607 and 121,821.