Bitcoin has a finite supply of 21 million and that means that it can not be manipulated like fiat currencies. It's limited supply means that no centralized authorities like CBN can mint more of it and cause a likelihood of inflation. Bitcoin was structured from it's creation as a decentralized digital cash with a limited supply which makes it an hedge against inflation.
Bitcoin's scarcity is one of the mechanisms that gives it its value. But the 21 million cap can be changed if there is consensus for such a change and a hard fork. But this would be close to impossible to obtain, and I don't see why anyone serious would propose such a move let alone support a devaluation of bitcoin. In fact, any number of bitcoin is enough (even less than 21 million) because it is divisible to far below a 1 cent value.