13,721 in words
13,721
thirteen thousand seven hundred and twenty-one
13,721 is written thirteen thousand seven hundred and twenty-one.
Ways to write it
- As an ordinal
- thirteen thousand seven hundred and twenty-first
- Expanded form
- 10,000 + 3,000 + 700 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 1 | 10,000 |
| thousands | 3 | 3,000 |
| hundreds | 7 | 700 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 13,721 (2 factors)
- First 10 multiples
- 13,721, 27,442, 41,163, 54,884, 68,605, 82,326, 96,047, 109,768, 123,489, 137,210
- Square
- 13,721 × 13,721 = 188,265,841
- Square root
- ≈ 117.14
- Sum of the digits
- 1 + 3 + 7 + 2 + 1 = 14
- Rounded to the nearest 10
- 13,720
- Rounded to the nearest 100
- 13,700
- Rounded to the nearest 1000
- 14,000
- Number before
- 13,720
- Number after
- 13,722
- In binary
11010110011001
Quick check
What number comes just after 13,721?
Show the answer
13,722
Is 13,721 even or odd?
Show the answer
Odd
What is 13,721 + 10?
Show the answer
13,731
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 13,721 in words?
13,721 is written "thirteen thousand seven hundred and twenty-one".
Is 13,721 a prime number?
Yes. 13,721 is a prime number: its only factors are 1 and 13,721.
What are the factors of 13,721?
The factors of 13,721 are 1 and 13,721.