Hello student you can calculate and get your rank easily by using this formula.
100 - (your total percentile) 869010 /100
In your case your rank must be around 35,629.
Cut off vary every year on various factors like the level of question in the entrance examination and total number of applicants in that examination.
So predicting exact cut off is difficult, JEE main will declare its official cut off after the Jee main April examination.

Feel free to comment if you have any doubt
Good luck

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