How many thirthankar in anthagad suthra
None.
Antagad (Antakrddasha) Sutra does not list Tirthankaras. It narrates the lives of 90 souls who ended samsara and attained moksha in that very lifetime. Tirthankaras are always 24, described and revered elsewhere in the canon.
Note:
- Śvetāmbara tradition: Antakrddasha is the 8th Anga.
- Digambara tradition: this Anga is not preserved as part of their surviving canon.