Is saitama immortal?

Is saitama immortal?

Saitama is nither immortal nor invulnerable. He is just a lot stronger than any other creature in the One Punch Man world. But, if he fell into lava, suffocated, drowned, etc. That should kill him.

Can Deadpool defeat Saitama?

Deadpool wins if Saitama gives up trying to incap/kill him. Or if he himself incaps/kills Saitama (virtually impossible). Saitama wins if Deadpool is a dead pool.