21,823 in words
21,823
twenty-one thousand eight hundred twenty-three
21,823 is written twenty-one thousand eight hundred twenty-three.
Ways to write it
- As an ordinal
- twenty-one thousand eight hundred twenty-third
- Expanded form
- 20,000 + 1,000 + 800 + 20 + 3
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 8 | 800 |
| tens | 2 | 20 |
| ones | 3 | 3 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 139, 157 and 21,823 (4 factors)
- First 10 multiples
- 21,823, 43,646, 65,469, 87,292, 109,115, 130,938, 152,761, 174,584, 196,407, 218,230
- Square
- 21,823 × 21,823 = 476,243,329
- Square root
- ≈ 147.73
- Sum of the digits
- 2 + 1 + 8 + 2 + 3 = 16
- Rounded to the nearest 10
- 21,820
- Rounded to the nearest 100
- 21,800
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,822
- Number after
- 21,824
- In binary
101010100111111
Quick check
What number comes just after 21,823?
Show the answer
21,824
Is 21,823 even or odd?
Show the answer
Odd
What is 21,823 + 10?
Show the answer
21,833
Practice 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 21,823 in words?
21,823 is written "twenty-one thousand eight hundred twenty-three".
Is 21,823 a prime number?
No. 21,823 is a composite number, because it has more than two factors.
What are the factors of 21,823?
The factors of 21,823 are 1, 139, 157 and 21,823.