A true eBook is published in ePub, HTML or PDF format. You’d need to check the Google Store to see if they will accept an APK as an app or an eBook. I suspect they will not. Amazon, Barnes and Noble and SmashWords don’t like APK’s as eBook submissions.
Kwik, which uses the Corona output for publishing, will only output lua, image, sound and video files to Corona - you don’t get any publishable file structure for an eBook. The Apple store will only accept the output from their proprietary iBook Author program in the section of the store that could pass as eBooks.
So what you actually are looking for is a way to use Corona to output that ePub or PDF file. Amazon and Smashwords are the two best places to go for the file types and regs governing eBook submission.