21,429 in words
21,429
twenty-one thousand four hundred twenty-nine
21,429 is written twenty-one thousand four hundred twenty-nine.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred twenty-ninth
- Expanded form
- 20,000 + 1,000 + 400 + 20 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 2 | 20 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 9, 2,381, 7,143 and 21,429 (6 factors)
- First 10 multiples
- 21,429, 42,858, 64,287, 85,716, 107,145, 128,574, 150,003, 171,432, 192,861, 214,290
- Square
- 21,429 × 21,429 = 459,202,041
- Square root
- ≈ 146.39
- Sum of the digits
- 2 + 1 + 4 + 2 + 9 = 18
- Rounded to the nearest 10
- 21,430
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,428
- Number after
- 21,430
- In binary
101001110110101
Quick check
What number comes just after 21,429?
Show the answer
21,430
Is 21,429 even or odd?
Show the answer
Odd
What is 21,429 + 10?
Show the answer
21,439
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 21,429 in words?
21,429 is written "twenty-one thousand four hundred twenty-nine".
Is 21,429 a prime number?
No. 21,429 is a composite number, because it has more than two factors.
What are the factors of 21,429?
The factors of 21,429 are 1, 3, 9, 2,381, 7,143 and 21,429.