If all BTC is here ,that is 21million,and NXT is 1billion, so the biggest exchange for them is :1NXT=0.021BTC.
Is my cognition right?
The decimal place in BTC is arbitrary. Technically because 1 Bitcoin is divisible to 8 decimal places there are in fact 21 Million x 10^8 individual usable Bitcoin tokens. There are only 1 Billion usable NXT tokens currently because each 1 NXT token is not currently divisible.
So that is 2,100,000,000,000,000 or 2.1 Quadrillion Bitcoin versus 1 Billion NXT.
So 1 NXT could be worth 2,100,000 BTC by your logic. Great!