21,388 in words
21,388
twenty-one thousand three hundred eighty-eight
21,388 is written twenty-one thousand three hundred eighty-eight.
Ways to write it
- As an ordinal
- twenty-one thousand three hundred eighty-eighth
- Expanded form
- 20,000 + 1,000 + 300 + 80 + 8
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 3 | 300 |
| tens | 8 | 80 |
| ones | 8 | 8 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5,347, 10,694 and 21,388 (6 factors)
- First 10 multiples
- 21,388, 42,776, 64,164, 85,552, 106,940, 128,328, 149,716, 171,104, 192,492, 213,880
- Square
- 21,388 × 21,388 = 457,446,544
- Square root
- ≈ 146.25
- Sum of the digits
- 2 + 1 + 3 + 8 + 8 = 22
- Rounded to the nearest 10
- 21,390
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,387
- Number after
- 21,389
- In binary
101001110001100
Quick check
What number comes just after 21,388?
Show the answer
21,389
Is 21,388 even or odd?
Show the answer
Even
What is 21,388 + 10?
Show the answer
21,398
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 21,388 in words?
21,388 is written "twenty-one thousand three hundred eighty-eight".
Is 21,388 a prime number?
No. 21,388 is a composite number, because it has more than two factors.
What are the factors of 21,388?
The factors of 21,388 are 1, 2, 4, 5,347, 10,694 and 21,388.