21,139 in words
21,139
twenty-one thousand one hundred thirty-nine
21,139 is written twenty-one thousand one hundred thirty-nine.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred thirty-ninth
- Expanded form
- 20,000 + 1,000 + 100 + 30 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 3 | 30 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,139 (2 factors)
- First 10 multiples
- 21,139, 42,278, 63,417, 84,556, 105,695, 126,834, 147,973, 169,112, 190,251, 211,390
- Square
- 21,139 × 21,139 = 446,857,321
- Square root
- ≈ 145.39
- Sum of the digits
- 2 + 1 + 1 + 3 + 9 = 16
- Rounded to the nearest 10
- 21,140
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,138
- Number after
- 21,140
- In binary
101001010010011
Quick check
What number comes just after 21,139?
Show the answer
21,140
Is 21,139 even or odd?
Show the answer
Odd
What is 21,139 + 10?
Show the answer
21,149
Practice 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 21,139 in words?
21,139 is written "twenty-one thousand one hundred thirty-nine".
Is 21,139 a prime number?
Yes. 21,139 is a prime number: its only factors are 1 and 21,139.
What are the factors of 21,139?
The factors of 21,139 are 1 and 21,139.