Q: What is the digital root of 21,660,751

 A: 1

Why is 1 the digital root of the number 21,660,751?

The digital root of a number is calculated by splitting the digits of a number and then adding them together. You keep splitting and adding the digits until you reach a single positive number.

How do you calculate the digital root of 21,660,751?


Split the number up and add each digit together:


2 + 1 + 6 + 6 + 0 + 7 + 5 + 1 = 28

If the answer is more than one digit, you would add each digit of the answer together again:

2 + 8 = 10

The answer is more than one digit again, we need to add each digit one more time:

1 + 0 = 1

What is the digital root of number 21,660,751?

Answer: 1


More Examples

Number 21,660,74921,660,75021,660,75221,660,753
Digital Root 8923

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