21,120 in words
21,120
twenty-one thousand one hundred twenty
21,120 is written twenty-one thousand one hundred twenty.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred twentieth
- Expanded form
- 20,000 + 1,000 + 100 + 20
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 2 | 20 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 64 factors: too many to list
- First 10 multiples
- 21,120, 42,240, 63,360, 84,480, 105,600, 126,720, 147,840, 168,960, 190,080, 211,200
- Square
- 21,120 × 21,120 = 446,054,400
- Square root
- ≈ 145.33
- Sum of the digits
- 2 + 1 + 1 + 2 + 0 = 6
- Rounded to the nearest 10
- 21,120
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,119
- Number after
- 21,121
- In binary
101001010000000
Quick check
What number comes just after 21,120?
Show the answer
21,121
Is 21,120 even or odd?
Show the answer
Even
What is 21,120 + 10?
Show the answer
21,130
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 21,120 in words?
21,120 is written "twenty-one thousand one hundred twenty".
Is 21,120 a prime number?
No. 21,120 is a composite number, because it has more than two factors.