Sum of Digits of 21
ANSWER : 3
The sum of the digits in the number 21 is: 2 + 1 = 3
How to Calculate the Digit Sum of 21?
To find the sum of digits of a number, simply break it into individual digits and add them. For 21:
2 + 1 = 3
The digits of 21 are: 2, 1.
Their sum is: 3
Step-by-Step Digit Sum of 21
We split the number 21 into its individual digits: 2 + 1 = 3
Digit Positions in 21
| Position | Digit |
|---|---|
| 1 | 2 |
| 2 | 1 |
Length of 21
The number 21 has 2 digits.
Is 3 a Prime Number?
Yes, 3 is a prime number.
Digit Sums in Other Bases
- Binary: 10101 → 3
- Octal: 25 → 7
- Hexadecimal: 15 → 6