840,021 in words
840,021
eight hundred and forty thousand and twenty-one
840,021 is written eight hundred and forty thousand and twenty-one.
Ways to write it
- As an ordinal
- eight hundred and forty thousand and twenty-first
- Expanded form
- 800,000 + 40,000 + 20 + 1
Place value
| Place | Digit | Value |
|---|---|---|
| hundred thousands | 8 | 800,000 |
| ten thousands | 4 | 40,000 |
| thousands | 0 | 0 |
| hundreds | 0 | 0 |
| tens | 2 | 20 |
| ones | 1 | 1 |
Number facts
- Even or odd
- Odd
- Prime or composite
- Composite
- Factors
- 1, 3, 7, 13, 17, 21, 39, 51, 91, 119, 181, 221, 273, 357, 543, 663, 1,267, 1,547, 2,353, 3,077, 3,801, 4,641, 7,059, 9,231, 16,471, 21,539, 40,001, 49,413, 64,617, 120,003, 280,007 and 840,021 (32 factors)
- First 10 multiples
- 840,021, 1,680,042, 2,520,063, 3,360,084, 4,200,105, 5,040,126, 5,880,147, 6,720,168, 7,560,189, 8,400,210
- Square
- 840,021 × 840,021 = 705,635,280,441
- Square root
- ≈ 916.53
- Sum of the digits
- 8 + 4 + 0 + 0 + 2 + 1 = 15
- Rounded to the nearest 10
- 840,020
- Rounded to the nearest 100
- 840,000
- Rounded to the nearest 1000
- 840,000
- Number before
- 840,020
- Number after
- 840,022
- In binary
11001101000101010101
Quick check
What number comes just after 840,021?
Show the answer
840,022
Is 840,021 even or odd?
Show the answer
Odd
What is 840,021 + 10?
Show the answer
840,031
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 840,021 in words?
840,021 is written "eight hundred and forty thousand and twenty-one".
Is 840,021 a prime number?
No. 840,021 is a composite number, because it has more than two factors.
What are the factors of 840,021?
The factors of 840,021 are 1, 3, 7, 13, 17, 21, 39, 51, 91, 119, 181, 221, 273, 357, 543, 663, 1,267, 1,547, 2,353, 3,077, 3,801, 4,641, 7,059, 9,231, 16,471, 21,539, 40,001, 49,413, 64,617, 120,003, 280,007 and 840,021.