21,478 in words
21,478
twenty-one thousand four hundred seventy-eight
21,478 is written twenty-one thousand four hundred seventy-eight.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred seventy-eighth
- Expanded form
- 20,000 + 1,000 + 400 + 70 + 8
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 7 | 70 |
| ones | 8 | 8 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 10,739 and 21,478 (4 factors)
- First 10 multiples
- 21,478, 42,956, 64,434, 85,912, 107,390, 128,868, 150,346, 171,824, 193,302, 214,780
- Square
- 21,478 × 21,478 = 461,304,484
- Square root
- ≈ 146.55
- Sum of the digits
- 2 + 1 + 4 + 7 + 8 = 22
- Rounded to the nearest 10
- 21,480
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,477
- Number after
- 21,479
- In binary
101001111100110
Quick check
What number comes just after 21,478?
Show the answer
21,479
Is 21,478 even or odd?
Show the answer
Even
What is 21,478 + 10?
Show the answer
21,488
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 21,478 in words?
21,478 is written "twenty-one thousand four hundred seventy-eight".
Is 21,478 a prime number?
No. 21,478 is a composite number, because it has more than two factors.
What are the factors of 21,478?
The factors of 21,478 are 1, 2, 10,739 and 21,478.