21,143 in words
21,143
twenty-one thousand one hundred and forty-three
21,143 is written twenty-one thousand one hundred and forty-three.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred and forty-third
- Expanded form
- 20,000 + 1,000 + 100 + 40 + 3
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 4 | 40 |
| ones | 3 | 3 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,143 (2 factors)
- First 10 multiples
- 21,143, 42,286, 63,429, 84,572, 105,715, 126,858, 148,001, 169,144, 190,287, 211,430
- Square
- 21,143 × 21,143 = 447,026,449
- Square root
- ≈ 145.41
- Sum of the digits
- 2 + 1 + 1 + 4 + 3 = 11
- Rounded to the nearest 10
- 21,140
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,142
- Number after
- 21,144
- In binary
101001010010111
Quick check
What number comes just after 21,143?
Show the answer
21,144
Is 21,143 even or odd?
Show the answer
Odd
What is 21,143 + 10?
Show the answer
21,153
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 21,143 in words?
21,143 is written "twenty-one thousand one hundred and forty-three".
Is 21,143 a prime number?
Yes. 21,143 is a prime number: its only factors are 1 and 21,143.
What are the factors of 21,143?
The factors of 21,143 are 1 and 21,143.