21,389 in words
21,389
twenty-one thousand three hundred eighty-nine
21,389 is written twenty-one thousand three hundred eighty-nine.
Ways to write it
- As an ordinal
- twenty-one thousand three hundred eighty-ninth
- Expanded form
- 20,000 + 1,000 + 300 + 80 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 3 | 300 |
| tens | 8 | 80 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 73, 293 and 21,389 (4 factors)
- First 10 multiples
- 21,389, 42,778, 64,167, 85,556, 106,945, 128,334, 149,723, 171,112, 192,501, 213,890
- Square
- 21,389 × 21,389 = 457,489,321
- Square root
- ≈ 146.25
- Sum of the digits
- 2 + 1 + 3 + 8 + 9 = 23
- Rounded to the nearest 10
- 21,390
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,388
- Number after
- 21,390
- In binary
101001110001101
Quick check
What number comes just after 21,389?
Show the answer
21,390
Is 21,389 even or odd?
Show the answer
Odd
What is 21,389 + 10?
Show the answer
21,399
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 21,389 in words?
21,389 is written "twenty-one thousand three hundred eighty-nine".
Is 21,389 a prime number?
No. 21,389 is a composite number, because it has more than two factors.
What are the factors of 21,389?
The factors of 21,389 are 1, 73, 293 and 21,389.