21,004 in words
21,004
twenty-one thousand four
21,004 is written twenty-one thousand four.
Ways to write it
- As an ordinal
- twenty-one thousand fourth
- Expanded form
- 20,000 + 1,000 + 4
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 0 | 0 |
| ones | 4 | 4 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 59, 89, 118, 178, 236, 356, 5,251, 10,502 and 21,004 (12 factors)
- First 10 multiples
- 21,004, 42,008, 63,012, 84,016, 105,020, 126,024, 147,028, 168,032, 189,036, 210,040
- Square
- 21,004 × 21,004 = 441,168,016
- Square root
- ≈ 144.93
- Sum of the digits
- 2 + 1 + 0 + 0 + 4 = 7
- Rounded to the nearest 10
- 21,000
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,003
- Number after
- 21,005
- In binary
101001000001100
Quick check
What number comes just after 21,004?
Show the answer
21,005
Is 21,004 even or odd?
Show the answer
Even
What is 21,004 + 10?
Show the answer
21,014
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 21,004 in words?
21,004 is written "twenty-one thousand four".
Is 21,004 a prime number?
No. 21,004 is a composite number, because it has more than two factors.
What are the factors of 21,004?
The factors of 21,004 are 1, 2, 4, 59, 89, 118, 178, 236, 356, 5,251, 10,502 and 21,004.