21,423 in words
21,423
twenty-one thousand four hundred twenty-three
21,423 is written twenty-one thousand four hundred twenty-three.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred twenty-third
- Expanded form
- 20,000 + 1,000 + 400 + 20 + 3
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 2 | 20 |
| ones | 3 | 3 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 37, 111, 193, 579, 7,141 and 21,423 (8 factors)
- First 10 multiples
- 21,423, 42,846, 64,269, 85,692, 107,115, 128,538, 149,961, 171,384, 192,807, 214,230
- Square
- 21,423 × 21,423 = 458,944,929
- Square root
- ≈ 146.37
- Sum of the digits
- 2 + 1 + 4 + 2 + 3 = 12
- Rounded to the nearest 10
- 21,420
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,422
- Number after
- 21,424
- In binary
101001110101111
Quick check
What number comes just after 21,423?
Show the answer
21,424
Is 21,423 even or odd?
Show the answer
Odd
What is 21,423 + 10?
Show the answer
21,433
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 21,423 in words?
21,423 is written "twenty-one thousand four hundred twenty-three".
Is 21,423 a prime number?
No. 21,423 is a composite number, because it has more than two factors.
What are the factors of 21,423?
The factors of 21,423 are 1, 3, 37, 111, 193, 579, 7,141 and 21,423.