21,789 in words
21,789
twenty-one thousand seven hundred and eighty-nine
21,789 is written twenty-one thousand seven hundred and eighty-nine.
Ways to write it
- As an ordinal
- twenty-one thousand seven hundred and eighty-ninth
- Expanded form
- 20,000 + 1,000 + 700 + 80 + 9
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 7 | 700 |
| tens | 8 | 80 |
| ones | 9 | 9 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 9, 27, 81, 269, 807, 2,421, 7,263 and 21,789 (10 factors)
- First 10 multiples
- 21,789, 43,578, 65,367, 87,156, 108,945, 130,734, 152,523, 174,312, 196,101, 217,890
- Square
- 21,789 × 21,789 = 474,760,521
- Square root
- ≈ 147.61
- Sum of the digits
- 2 + 1 + 7 + 8 + 9 = 27
- Rounded to the nearest 10
- 21,790
- Rounded to the nearest 100
- 21,800
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,788
- Number after
- 21,790
- In binary
101010100011101
Quick check
What number comes just after 21,789?
Show the answer
21,790
Is 21,789 even or odd?
Show the answer
Odd
What is 21,789 + 10?
Show the answer
21,799
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 21,789 in words?
21,789 is written "twenty-one thousand seven hundred and eighty-nine".
Is 21,789 a prime number?
No. 21,789 is a composite number, because it has more than two factors.
What are the factors of 21,789?
The factors of 21,789 are 1, 3, 9, 27, 81, 269, 807, 2,421, 7,263 and 21,789.