13,821 in words
13,821
thirteen thousand eight hundred and twenty-one
13,821 is written thirteen thousand eight hundred and twenty-one.
Ways to write it
- As an ordinal
- thirteen thousand eight hundred and twenty-first
- Expanded form
- 10,000 + 3,000 + 800 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 1 | 10,000 |
| thousands | 3 | 3,000 |
| hundreds | 8 | 800 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 17, 51, 271, 813, 4,607 and 13,821 (8 factors)
- First 10 multiples
- 13,821, 27,642, 41,463, 55,284, 69,105, 82,926, 96,747, 110,568, 124,389, 138,210
- Square
- 13,821 × 13,821 = 191,020,041
- Square root
- ≈ 117.56
- Sum of the digits
- 1 + 3 + 8 + 2 + 1 = 15
- Rounded to the nearest 10
- 13,820
- Rounded to the nearest 100
- 13,800
- Rounded to the nearest 1000
- 14,000
- Number before
- 13,820
- Number after
- 13,822
- In binary
11010111111101
Quick check
What number comes just after 13,821?
Show the answer
13,822
Is 13,821 even or odd?
Show the answer
Odd
What is 13,821 + 10?
Show the answer
13,831
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 13,821 in words?
13,821 is written "thirteen thousand eight hundred and twenty-one".
Is 13,821 a prime number?
No. 13,821 is a composite number, because it has more than two factors.
What are the factors of 13,821?
The factors of 13,821 are 1, 3, 17, 51, 271, 813, 4,607 and 13,821.