21,355 in words
21,355
twenty-one thousand three hundred fifty-five
21,355 is written twenty-one thousand three hundred fifty-five.
Ways to write it
- As an ordinal
- twenty-one thousand three hundred fifty-fifth
- Expanded form
- 20,000 + 1,000 + 300 + 50 + 5
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 3 | 300 |
| tens | 5 | 50 |
| ones | 5 | 5 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 5, 4,271 and 21,355 (4 factors)
- First 10 multiples
- 21,355, 42,710, 64,065, 85,420, 106,775, 128,130, 149,485, 170,840, 192,195, 213,550
- Square
- 21,355 × 21,355 = 456,036,025
- Square root
- ≈ 146.13
- Sum of the digits
- 2 + 1 + 3 + 5 + 5 = 16
- Rounded to the nearest 10
- 21,360
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,354
- Number after
- 21,356
- In binary
101001101101011
Quick check
What number comes just after 21,355?
Show the answer
21,356
Is 21,355 even or odd?
Show the answer
Odd
What is 21,355 + 10?
Show the answer
21,365
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 21,355 in words?
21,355 is written "twenty-one thousand three hundred fifty-five".
Is 21,355 a prime number?
No. 21,355 is a composite number, because it has more than two factors.
What are the factors of 21,355?
The factors of 21,355 are 1, 5, 4,271 and 21,355.