Palantir (NASDAQ: PLTR) is one of the hottest artificial intelligence (AI) stocks out there. Compared to today's stock price of around $75, that represents a 40% downside. It's not often that a stock is priced this much over analysts' targets.

Palantir would need to grow into a $6.7 trillion market cap to turn a $25,000 investment into $1 million. This would be its valuation if it grew to 40 times its size today. There isn't even a $4 trillion stock on the market today but in 20 or 30 years, it may be much more common to see stocks trading at these types of valuations.