Clue 1: each digit increased by 1 and clue 2 add the numbers and the answer is 21. whats the six digit number?

1+2+3+4+5+6=21

So the number is 123456.

To find the six-digit number, we need to follow the clues given.

Clue 1 states that each digit of the number is increased by 1. This means that the original number must consist of digits ranging from 0 to 8 since adding 1 to each digit will result in digits ranging from 1 to 9.

Clue 2 states that when we add all the digits of the number together, the sum is 21.

Given that we need to find a six-digit number, there are a few constraints we can deduce before starting the trial-and-error process:

1. The sum of all the digits will be 21.
2. Since each digit is increased by 1, the digits must be in the range of 1 to 9.

With these constraints in mind, let's begin the process:

Start with the highest possible digit, 9, and try different combinations starting with it:

9 _ _ _ _ _
- The remaining five digits must sum up to 12 since 9 + 1 + 1 + 1 + 1 = 13.

Possible combinations:
- 6, 3, 2, 1, 1 (sum = 14, not equal to 12)
- 5, 4, 2, 1, 1 (sum = 13, not equal to 12)
- 4, 4, 3, 1, 1 (sum = 13, not equal to 12)

Based on the given clues, there is no six-digit number that satisfies the requirements. It is possible that there is an error or missing information in the puzzle.