Hi,
Regarding your query, the cutoff for Computer Science and Engineering in NIT Silchar in the year 2021 was 15557 for female candidates. And you stated your rank is 21529, so chances are a bit low.
But cutoffs vary slightly every year due to many factors, and you can try for CSE in NIT Silchar by putting it at the top of your list during josaa choice filling. If you get lucky, then you might get a seat there.
You can even predict your own college based on your JEE Main rank by using the JEE Main 2022 College Predictor - https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp
Good luck.
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