21,380 in words
21,380
twenty-one thousand three hundred eighty
21,380 is written twenty-one thousand three hundred eighty.
Ways to write it
- As an ordinal
- twenty-one thousand three hundred eightieth
- Expanded form
- 20,000 + 1,000 + 300 + 80
Place value
| Place | Digit | Value |
|---|---|---|
| ten thousands | 2 | 20,000 |
| thousands | 1 | 1,000 |
| hundreds | 3 | 300 |
| tens | 8 | 80 |
| ones | 0 | 0 |
Number facts
- Even or odd
- Even
- Prime or composite
- Composite
- Factors
- 1, 2, 4, 5, 10, 20, 1,069, 2,138, 4,276, 5,345, 10,690 and 21,380 (12 factors)
- First 10 multiples
- 21,380, 42,760, 64,140, 85,520, 106,900, 128,280, 149,660, 171,040, 192,420, 213,800
- Square
- 21,380 × 21,380 = 457,104,400
- Square root
- ≈ 146.22
- Sum of the digits
- 2 + 1 + 3 + 8 + 0 = 14
- Rounded to the nearest 10
- 21,380
- Rounded to the nearest 100
- 21,400
- Rounded to the nearest 1000
- 21,000
- Number before
- 21,379
- Number after
- 21,381
- In binary
101001110000100
Quick check
What number comes just after 21,380?
Show the answer
21,381
Is 21,380 even or odd?
Show the answer
Even
What is 21,380 + 10?
Show the answer
21,390
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 21,380 in words?
21,380 is written "twenty-one thousand three hundred eighty".
Is 21,380 a prime number?
No. 21,380 is a composite number, because it has more than two factors.
What are the factors of 21,380?
The factors of 21,380 are 1, 2, 4, 5, 10, 20, 1,069, 2,138, 4,276, 5,345, 10,690 and 21,380.