40,821 in words
40,821
forty thousand eight hundred twenty-one
40,821 is written forty thousand eight hundred twenty-one.
Ways to write it
- As an ordinal
- forty thousand eight hundred twenty-first
- Expanded form
- 40,000 + 800 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 4 | 40,000 |
| thousands | 0 | 0 |
| hundreds | 8 | 800 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 11, 33, 1,237, 3,711, 13,607 and 40,821 (8 factors)
- First 10 multiples
- 40,821, 81,642, 122,463, 163,284, 204,105, 244,926, 285,747, 326,568, 367,389, 408,210
- Square
- 40,821 × 40,821 = 1,666,354,041
- Square root
- ≈ 202.04
- Sum of the digits
- 4 + 0 + 8 + 2 + 1 = 15
- Rounded to the nearest 10
- 40,820
- Rounded to the nearest 100
- 40,800
- Rounded to the nearest 1000
- 41,000
- Number before
- 40,820
- Number after
- 40,822
- In binary
1001111101110101
Quick check
What number comes just after 40,821?
Show the answer
40,822
Is 40,821 even or odd?
Show the answer
Odd
What is 40,821 + 10?
Show the answer
40,831
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 40,821 in words?
40,821 is written "forty thousand eight hundred twenty-one".
Is 40,821 a prime number?
No. 40,821 is a composite number, because it has more than two factors.
What are the factors of 40,821?
The factors of 40,821 are 1, 3, 11, 33, 1,237, 3,711, 13,607 and 40,821.