21,047 in words
21,047
twenty-one thousand forty-seven
21,047 is written twenty-one thousand forty-seven.
Ways to write it
- As an ordinal
- twenty-one thousand forty-seventh
- Expanded form
- 20,000 + 1,000 + 40 + 7
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 4 | 40 |
| ones | 7 | 7 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 13, 1,619 and 21,047 (4 factors)
- First 10 multiples
- 21,047, 42,094, 63,141, 84,188, 105,235, 126,282, 147,329, 168,376, 189,423, 210,470
- Square
- 21,047 × 21,047 = 442,976,209
- Square root
- ≈ 145.08
- Sum of the digits
- 2 + 1 + 0 + 4 + 7 = 14
- Rounded to the nearest 10
- 21,050
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,046
- Number after
- 21,048
- In binary
101001000110111
Quick check
What number comes just after 21,047?
Show the answer
21,048
Is 21,047 even or odd?
Show the answer
Odd
What is 21,047 + 10?
Show the answer
21,057
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 21,047 in words?
21,047 is written "twenty-one thousand forty-seven".
Is 21,047 a prime number?
No. 21,047 is a composite number, because it has more than two factors.
What are the factors of 21,047?
The factors of 21,047 are 1, 13, 1,619 and 21,047.