21,490 in words
21,490
twenty-one thousand four hundred ninety
21,490 is written twenty-one thousand four hundred ninety.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred ninetieth
- Expanded form
- 20,000 + 1,000 + 400 + 90
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 9 | 90 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 5, 7, 10, 14, 35, 70, 307, 614, 1,535, 2,149, 3,070, 4,298, 10,745 and 21,490 (16 factors)
- First 10 multiples
- 21,490, 42,980, 64,470, 85,960, 107,450, 128,940, 150,430, 171,920, 193,410, 214,900
- Square
- 21,490 × 21,490 = 461,820,100
- Square root
- ≈ 146.59
- Sum of the digits
- 2 + 1 + 4 + 9 + 0 = 16
- Rounded to the nearest 10
- 21,490
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,489
- Number after
- 21,491
- In binary
101001111110010
Quick check
What number comes just after 21,490?
Show the answer
21,491
Is 21,490 even or odd?
Show the answer
Even
What is 21,490 + 10?
Show the answer
21,500
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 21,490 in words?
21,490 is written "twenty-one thousand four hundred ninety".
Is 21,490 a prime number?
No. 21,490 is a composite number, because it has more than two factors.
What are the factors of 21,490?
The factors of 21,490 are 1, 2, 5, 7, 10, 14, 35, 70, 307, 614, 1,535, 2,149, 3,070, 4,298, 10,745 and 21,490.