21,406 in words
21,406
twenty-one thousand four hundred and six
21,406 is written twenty-one thousand four hundred and six.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred and sixth
- Expanded form
- 20,000 + 1,000 + 400 + 6
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 0 | 0 |
| ones | 6 | 6 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 7, 11, 14, 22, 77, 139, 154, 278, 973, 1,529, 1,946, 3,058, 10,703 and 21,406 (16 factors)
- First 10 multiples
- 21,406, 42,812, 64,218, 85,624, 107,030, 128,436, 149,842, 171,248, 192,654, 214,060
- Square
- 21,406 × 21,406 = 458,216,836
- Square root
- ≈ 146.31
- Sum of the digits
- 2 + 1 + 4 + 0 + 6 = 13
- Rounded to the nearest 10
- 21,410
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,405
- Number after
- 21,407
- In binary
101001110011110
Quick check
What number comes just after 21,406?
Show the answer
21,407
Is 21,406 even or odd?
Show the answer
Even
What is 21,406 + 10?
Show the answer
21,416
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 21,406 in words?
21,406 is written "twenty-one thousand four hundred and six".
Is 21,406 a prime number?
No. 21,406 is a composite number, because it has more than two factors.
What are the factors of 21,406?
The factors of 21,406 are 1, 2, 7, 11, 14, 22, 77, 139, 154, 278, 973, 1,529, 1,946, 3,058, 10,703 and 21,406.