20,921 in words
20,921
twenty thousand nine hundred and twenty-one
20,921 is written twenty thousand nine hundred and twenty-one.
Ways to write it
- As an ordinal
- twenty thousand nine hundred and twenty-first
- Expanded form
- 20,000 + 900 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 0 | 0 |
| hundreds | 9 | 900 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 20,921 (2 factors)
- First 10 multiples
- 20,921, 41,842, 62,763, 83,684, 104,605, 125,526, 146,447, 167,368, 188,289, 209,210
- Square
- 20,921 × 20,921 = 437,688,241
- Square root
- ≈ 144.64
- Sum of the digits
- 2 + 0 + 9 + 2 + 1 = 14
- Rounded to the nearest 10
- 20,920
- Rounded to the nearest 100
- 20,900
- Rounded to the nearest 1000
- 21,000
- Number before
- 20,920
- Number after
- 20,922
- In binary
101000110111001
Quick check
What number comes just after 20,921?
Show the answer
20,922
Is 20,921 even or odd?
Show the answer
Odd
What is 20,921 + 10?
Show the answer
20,931
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 20,921 in words?
20,921 is written "twenty thousand nine hundred and twenty-one".
Is 20,921 a prime number?
Yes. 20,921 is a prime number: its only factors are 1 and 20,921.
What are the factors of 20,921?
The factors of 20,921 are 1 and 20,921.