21,084 in words
21,084
twenty-one thousand eighty-four
21,084 is written twenty-one thousand eighty-four.
Ways to write it
- As an ordinal
- twenty-one thousand eighty-fourth
- Expanded form
- 20,000 + 1,000 + 80 + 4
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 8 | 80 |
| ones | 4 | 4 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84, 251, 502, 753, 1,004, 1,506, 1,757, 3,012, 3,514, 5,271, 7,028, 10,542 and 21,084 (24 factors)
- First 10 multiples
- 21,084, 42,168, 63,252, 84,336, 105,420, 126,504, 147,588, 168,672, 189,756, 210,840
- Square
- 21,084 × 21,084 = 444,535,056
- Square root
- ≈ 145.20
- Sum of the digits
- 2 + 1 + 0 + 8 + 4 = 15
- Rounded to the nearest 10
- 21,080
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,083
- Number after
- 21,085
- In binary
101001001011100
Quick check
What number comes just after 21,084?
Show the answer
21,085
Is 21,084 even or odd?
Show the answer
Even
What is 21,084 + 10?
Show the answer
21,094
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 21,084 in words?
21,084 is written "twenty-one thousand eighty-four".
Is 21,084 a prime number?
No. 21,084 is a composite number, because it has more than two factors.
What are the factors of 21,084?
The factors of 21,084 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84, 251, 502, 753, 1,004, 1,506, 1,757, 3,012, 3,514, 5,271, 7,028, 10,542 and 21,084.