With your AP EAPCET rank of 21,459, you can get admission in SRM University, AP. In 2024, students with ranks up to 35,000 got seats in CSE and other branches at SRM AP. So with your rank, you have a good chance to get CSE, ECE, or IT in this university, especially in later rounds of counselling.

You should register for the counselling, choose SRM University AP and select CSE or other related branches. If you don’t get CSE in the first round, you may get it in the second or third round.

Here are the websites where you can check the cutoffs and counselling updates:
https://engineering.careers360.com/articles/ap-eamcet-cutoff