21,209 in words
21,209
twenty-one thousand two hundred nine
21,209 is written twenty-one thousand two hundred nine.
Ways to write it
- As an ordinal
- twenty-one thousand two hundred ninth
- Expanded form
- 20,000 + 1,000 + 200 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 2 | 200 |
| tens | 0 | 0 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 127, 167 and 21,209 (4 factors)
- First 10 multiples
- 21,209, 42,418, 63,627, 84,836, 106,045, 127,254, 148,463, 169,672, 190,881, 212,090
- Square
- 21,209 × 21,209 = 449,821,681
- Square root
- ≈ 145.63
- Sum of the digits
- 2 + 1 + 2 + 0 + 9 = 14
- Rounded to the nearest 10
- 21,210
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,208
- Number after
- 21,210
- In binary
101001011011001
Quick check
What number comes just after 21,209?
Show the answer
21,210
Is 21,209 even or odd?
Show the answer
Odd
What is 21,209 + 10?
Show the answer
21,219
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 21,209 in words?
21,209 is written "twenty-one thousand two hundred nine".
Is 21,209 a prime number?
No. 21,209 is a composite number, because it has more than two factors.
What are the factors of 21,209?
The factors of 21,209 are 1, 127, 167 and 21,209.