You say that you have 2mil usd and want to invest on bitcoin, then go ahead and invest it over there.

Where can I invest it?
You mean where can you buy it?
That's a lot!, I've read that bitcoin is being mined and it's a bit costly to do mining because of the computer you need. I was thinking, since you have the that amount of money that you wanna invest, you could try investing on bitcoin mining farm. But I've also read that mining bitcoin is getting more difficult as every bitcoins are being mined, bitcoin has a specific amount that if they're already mined, them your mining farm would be of no use anymore. But if you have mined enough bitcoin to be considered as profit then I guess it is worth the investment.