21,243 in words
21,243
twenty-one thousand two hundred forty-three
21,243 is written twenty-one thousand two hundred forty-three.
Ways to write it
- As an ordinal
- twenty-one thousand two hundred forty-third
- Expanded form
- 20,000 + 1,000 + 200 + 40 + 3
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 2 | 200 |
| tens | 4 | 40 |
| ones | 3 | 3 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 73, 97, 219, 291, 7,081 and 21,243 (8 factors)
- First 10 multiples
- 21,243, 42,486, 63,729, 84,972, 106,215, 127,458, 148,701, 169,944, 191,187, 212,430
- Square
- 21,243 × 21,243 = 451,265,049
- Square root
- ≈ 145.75
- Sum of the digits
- 2 + 1 + 2 + 4 + 3 = 12
- Rounded to the nearest 10
- 21,240
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,242
- Number after
- 21,244
- In binary
101001011111011
Quick check
What number comes just after 21,243?
Show the answer
21,244
Is 21,243 even or odd?
Show the answer
Odd
What is 21,243 + 10?
Show the answer
21,253
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 21,243 in words?
21,243 is written "twenty-one thousand two hundred forty-three".
Is 21,243 a prime number?
No. 21,243 is a composite number, because it has more than two factors.
What are the factors of 21,243?
The factors of 21,243 are 1, 3, 73, 97, 219, 291, 7,081 and 21,243.