21,940 in words
21,940
twenty-one thousand nine hundred and forty
21,940 is written twenty-one thousand nine hundred and forty.
Ways to write it
- As an ordinal
- twenty-one thousand nine hundred and fortieth
- Expanded form
- 20,000 + 1,000 + 900 + 40
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 9 | 900 |
| tens | 4 | 40 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 10, 20, 1,097, 2,194, 4,388, 5,485, 10,970 and 21,940 (12 factors)
- First 10 multiples
- 21,940, 43,880, 65,820, 87,760, 109,700, 131,640, 153,580, 175,520, 197,460, 219,400
- Square
- 21,940 × 21,940 = 481,363,600
- Square root
- ≈ 148.12
- Sum of the digits
- 2 + 1 + 9 + 4 + 0 = 16
- Rounded to the nearest 10
- 21,940
- Rounded to the nearest 100
- 21,900
- Rounded to the nearest 1000
- 22,000
- Number before
- 21,939
- Number after
- 21,941
- In binary
101010110110100
Quick check
What number comes just after 21,940?
Show the answer
21,941
Is 21,940 even or odd?
Show the answer
Even
What is 21,940 + 10?
Show the answer
21,950
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 21,940 in words?
21,940 is written "twenty-one thousand nine hundred and forty".
Is 21,940 a prime number?
No. 21,940 is a composite number, because it has more than two factors.
What are the factors of 21,940?
The factors of 21,940 are 1, 2, 4, 5, 10, 20, 1,097, 2,194, 4,388, 5,485, 10,970 and 21,940.