21,440 in words
21,440
twenty-one thousand four hundred forty
21,440 is written twenty-one thousand four hundred forty.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred fortieth
- Expanded form
- 20,000 + 1,000 + 400 + 40
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 4 | 40 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 67, 80, 134, 160, 268, 320, 335, 536, 670, 1,072, 1,340, 2,144, 2,680, 4,288, 5,360, 10,720 and 21,440 (28 factors)
- First 10 multiples
- 21,440, 42,880, 64,320, 85,760, 107,200, 128,640, 150,080, 171,520, 192,960, 214,400
- Square
- 21,440 × 21,440 = 459,673,600
- Square root
- ≈ 146.42
- Sum of the digits
- 2 + 1 + 4 + 4 + 0 = 11
- Rounded to the nearest 10
- 21,440
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,439
- Number after
- 21,441
- In binary
101001111000000
Quick check
What number comes just after 21,440?
Show the answer
21,441
Is 21,440 even or odd?
Show the answer
Even
What is 21,440 + 10?
Show the answer
21,450
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 21,440 in words?
21,440 is written "twenty-one thousand four hundred forty".
Is 21,440 a prime number?
No. 21,440 is a composite number, because it has more than two factors.
What are the factors of 21,440?
The factors of 21,440 are 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 67, 80, 134, 160, 268, 320, 335, 536, 670, 1,072, 1,340, 2,144, 2,680, 4,288, 5,360, 10,720 and 21,440.