21,216 in words
21,216
twenty-one thousand two hundred sixteen
21,216 is written twenty-one thousand two hundred sixteen.
Ways to write it
- As an ordinal
- twenty-one thousand two hundred sixteenth
- Expanded form
- 20,000 + 1,000 + 200 + 10 + 6
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 2 | 200 |
| tens | 1 | 10 |
| ones | 6 | 6 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 3, 4, 6, 8, 12, 13, 16, 17, 24, 26, 32, 34, 39, 48, 51, 52, 68, 78, 96, 102, 104, 136, 156, 204, 208, 221, 272, 312, 408, 416, 442, 544, 624, 663, 816, 884, 1,248, 1,326, 1,632, 1,768, 2,652, 3,536, 5,304, 7,072, 10,608 and 21,216 (48 factors)
- First 10 multiples
- 21,216, 42,432, 63,648, 84,864, 106,080, 127,296, 148,512, 169,728, 190,944, 212,160
- Square
- 21,216 × 21,216 = 450,118,656
- Square root
- ≈ 145.66
- Sum of the digits
- 2 + 1 + 2 + 1 + 6 = 12
- Rounded to the nearest 10
- 21,220
- Rounded to the nearest 100
- 21,200
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,215
- Number after
- 21,217
- In binary
101001011100000
Quick check
What number comes just after 21,216?
Show the answer
21,217
Is 21,216 even or odd?
Show the answer
Even
What is 21,216 + 10?
Show the answer
21,226
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 21,216 in words?
21,216 is written "twenty-one thousand two hundred sixteen".
Is 21,216 a prime number?
No. 21,216 is a composite number, because it has more than two factors.
What are the factors of 21,216?
The factors of 21,216 are 1, 2, 3, 4, 6, 8, 12, 13, 16, 17, 24, 26, 32, 34, 39, 48, 51, 52, 68, 78, 96, 102, 104, 136, 156, 204, 208, 221, 272, 312, 408, 416, 442, 544, 624, 663, 816, 884, 1,248, 1,326, 1,632, 1,768, 2,652, 3,536, 5,304, 7,072, 10,608 and 21,216.