Q: What is the digital root of 21,890,009

 A: 2

Why is 2 the digital root of the number 21,890,009?

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 21,890,009?


Split the number up and add each digit together:


2 + 1 + 8 + 9 + 0 + 0 + 0 + 9 = 29

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

2 + 9 = 11

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

1 + 1 = 2

What is the digital root of number 21,890,009?

Answer: 2


More Examples

Number 21,890,00721,890,00821,890,01021,890,011
Digital Root 9134

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