21,101 in words
21,101
twenty-one thousand one hundred one
21,101 is written twenty-one thousand one hundred one.
Ways to write it
- As an ordinal
- twenty-one thousand one hundred first
- Expanded form
- 20,000 + 1,000 + 100 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 1 | 100 |
| tens | 0 | 0 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,101 (2 factors)
- First 10 multiples
- 21,101, 42,202, 63,303, 84,404, 105,505, 126,606, 147,707, 168,808, 189,909, 211,010
- Square
- 21,101 × 21,101 = 445,252,201
- Square root
- ≈ 145.26
- Sum of the digits
- 2 + 1 + 1 + 0 + 1 = 5
- Rounded to the nearest 10
- 21,100
- Rounded to the nearest 100
- 21,100
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,100
- Number after
- 21,102
- In binary
101001001101101
Quick check
What number comes just after 21,101?
Show the answer
21,102
Is 21,101 even or odd?
Show the answer
Odd
What is 21,101 + 10?
Show the answer
21,111
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 21,101 in words?
21,101 is written "twenty-one thousand one hundred one".
Is 21,101 a prime number?
Yes. 21,101 is a prime number: its only factors are 1 and 21,101.
What are the factors of 21,101?
The factors of 21,101 are 1 and 21,101.