As the release date of Android 5.0 Lollipop keeps getting closer, more apps and information about what devices will get Google’s latest version of Android, but this is the first time information about the build number has leaked. According to LlabTooFeR (which has been pretty accurate with its predictions in the past) the final build number of Android 5.0 Lollipop could be LRX21K
Android L is currently available for developers, the first Developer Preview had build number LPV79 and the second one which was released a month later had build number LPV81C.
As of now, no official release date for Lollipop has been given but previous rumors indicate that it will become available November 3rd for the Nexus 5, Nexus 6, Nexus 10, Nexus 4, Nexus 7 (2012) and Nexus 7 (2013). The update will also become available on devices like the Galaxy S5, OnePlus One, HTC One M8 etc. for a full list, check out our post here.