(Other similar questions on this site don't have proper answer with scriptural reference. The Wikipedia answer doesn't cite sources, also don't think it's accurate, because Gita 'rudranam sankaras casmi', and sankar is not mentioned in that site)
We say there are 33 koti devas, but the word 'crore' is said to be a bad-translation of the word 'koti', which apparently means 'type', although I didn't find that definition in spokensanskrit.org
Any case, the 33 devas are said to be :
8 vasu + 12 aditya + 11 rudra + 2 ashvini = 33
What are the names of the 33 devas and what are the duties of their posts in universe ?