10,000,000,000,000,000,000
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4,558,977
Twentyone follows twenty
83 is the first prime number after 79.
"Still" implies that the original number is a square number. In that case, the answer is as follows: There is no number such that it is a perfect sqiuare and that the number increased (or decreased) by 10 is also a perfect square. And if you do not limit it to perfect square then every non-negative number is a square with the number that is 10 more also being a square.
The number that comes after 9999999 is 10000000. This number represents the next increment after reaching the maximum value of 9999999. In numerical order, the number 10000000 follows after 9999999.