42,021 in words
42,021
forty-two thousand and twenty-one
42,021 is written forty-two thousand and twenty-one.
Ways to write it
- As an ordinal
- forty-two thousand and twenty-first
- Expanded form
- 40,000 + 2,000 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 4 | 40,000 |
| thousands | 2 | 2,000 |
| hundreds | 0 | 0 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 7, 9, 21, 23, 29, 63, 69, 87, 161, 203, 207, 261, 483, 609, 667, 1,449, 1,827, 2,001, 4,669, 6,003, 14,007 and 42,021 (24 factors)
- First 10 multiples
- 42,021, 84,042, 126,063, 168,084, 210,105, 252,126, 294,147, 336,168, 378,189, 420,210
- Square
- 42,021 × 42,021 = 1,765,764,441
- Square root
- ≈ 204.99
- Sum of the digits
- 4 + 2 + 0 + 2 + 1 = 9
- Rounded to the nearest 10
- 42,020
- Rounded to the nearest 100
- 42,000
- Rounded to the nearest 1000
- 42,000
- Number before
- 42,020
- Number after
- 42,022
- In binary
1010010000100101
Quick check
What number comes just after 42,021?
Show the answer
42,022
Is 42,021 even or odd?
Show the answer
Odd
What is 42,021 + 10?
Show the answer
42,031
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 42,021 in words?
42,021 is written "forty-two thousand and twenty-one".
Is 42,021 a prime number?
No. 42,021 is a composite number, because it has more than two factors.
What are the factors of 42,021?
The factors of 42,021 are 1, 3, 7, 9, 21, 23, 29, 63, 69, 87, 161, 203, 207, 261, 483, 609, 667, 1,449, 1,827, 2,001, 4,669, 6,003, 14,007 and 42,021.