21,481 in words
21,481
twenty-one thousand four hundred eighty-one
21,481 is written twenty-one thousand four hundred eighty-one.
Ways to write it
- As an ordinal
- twenty-one thousand four hundred eighty-first
- Expanded form
- 20,000 + 1,000 + 400 + 80 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 4 | 400 |
| tens | 8 | 80 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Prime
- Factors
- 1 and 21,481 (2 factors)
- First 10 multiples
- 21,481, 42,962, 64,443, 85,924, 107,405, 128,886, 150,367, 171,848, 193,329, 214,810
- Square
- 21,481 × 21,481 = 461,433,361
- Square root
- ≈ 146.56
- Sum of the digits
- 2 + 1 + 4 + 8 + 1 = 16
- Rounded to the nearest 10
- 21,480
- Rounded to the nearest 100
- 21,500
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,480
- Number after
- 21,482
- In binary
101001111101001
Quick check
What number comes just after 21,481?
Show the answer
21,482
Is 21,481 even or odd?
Show the answer
Odd
What is 21,481 + 10?
Show the answer
21,491
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 21,481 in words?
21,481 is written "twenty-one thousand four hundred eighty-one".
Is 21,481 a prime number?
Yes. 21,481 is a prime number: its only factors are 1 and 21,481.
What are the factors of 21,481?
The factors of 21,481 are 1 and 21,481.