21,023 in words
21,023
twenty-one thousand twenty-three
21,023 is written twenty-one thousand twenty-three.
Ways to write it
- As an ordinal
- twenty-one thousand twenty-third
- Expanded form
- 20,000 + 1,000 + 20 + 3
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 2 | 20 |
| ones | 3 | 3 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,023 (2 factors)
- First 10 multiples
- 21,023, 42,046, 63,069, 84,092, 105,115, 126,138, 147,161, 168,184, 189,207, 210,230
- Square
- 21,023 × 21,023 = 441,966,529
- Square root
- ≈ 144.99
- Sum of the digits
- 2 + 1 + 0 + 2 + 3 = 8
- Rounded to the nearest 10
- 21,020
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,022
- Number after
- 21,024
- In binary
101001000011111
Quick check
What number comes just after 21,023?
Show the answer
21,024
Is 21,023 even or odd?
Show the answer
Odd
What is 21,023 + 10?
Show the answer
21,033
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 21,023 in words?
21,023 is written "twenty-one thousand twenty-three".
Is 21,023 a prime number?
Yes. 21,023 is a prime number: its only factors are 1 and 21,023.
What are the factors of 21,023?
The factors of 21,023 are 1 and 21,023.