In the short scale, 999 trillion is 999,000,000,000,000, and the number after that is 999,000,000,000,001.
In the long scale, 999 trillion is 999,000,000,000,000,000,000, and the number after that is 999,000,000,000,000,000,001.
Adding either one thousand (in the short scale) or one million (in the long scale) gives a quadrillion (1,000,000,000,000,000 - short scale, 1,000,000,000,000,000,000,000,000 - long scale).
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The answer is 999.
9, 010, 000 comes one after 9, 009, 999.
A big number
The next number is one trillion and one. 1,000,000,000,000 ( one trillion). 1,000,000,000,001 ( is the next number).
This number I've never seen before, it is not in the numbers up to a novemtrigintillion (that's a 1 with 120 zeros following it) that I know of. Perhaps you are referring to dix trillion, which is French for ten trillion (dix is French for 10).