21,011 in words
21,011
twenty-one thousand eleven
21,011 is written twenty-one thousand eleven.
Ways to write it
- As an ordinal
- twenty-one thousand eleventh
- Expanded form
- 20,000 + 1,000 + 10 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 0 | 0 |
| tens | 1 | 10 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,011 (2 factors)
- First 10 multiples
- 21,011, 42,022, 63,033, 84,044, 105,055, 126,066, 147,077, 168,088, 189,099, 210,110
- Square
- 21,011 × 21,011 = 441,462,121
- Square root
- ≈ 144.95
- Sum of the digits
- 2 + 1 + 0 + 1 + 1 = 5
- Rounded to the nearest 10
- 21,010
- Rounded to the nearest 100
- 21,000
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,010
- Number after
- 21,012
- In binary
101001000010011
Quick check
What number comes just after 21,011?
Show the answer
21,012
Is 21,011 even or odd?
Show the answer
Odd
What is 21,011 + 10?
Show the answer
21,021
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 21,011 in words?
21,011 is written "twenty-one thousand eleven".
Is 21,011 a prime number?
Yes. 21,011 is a prime number: its only factors are 1 and 21,011.
What are the factors of 21,011?
The factors of 21,011 are 1 and 21,011.