Assuming everything on the planet was for sale, and assuming Bitcoin was the only viable means to purchase it, the whole world priced in fiat USD is estimated to be around $1 Quadrillion USD, assuming there's 21M BTC, and BTC is the only currency that is being used, each Bitcoin then would need to be $47-50M to purchase the entire planet, this is of course if selling the whole world was possible and you could find a buyer.
Discussion
It's a very difficult scenario to price. Most of the fiat prices are inflated due to easy money. There is so much distortion in asset prices due to fiat. If we were to switch to hard money and abolish Central Banking as well as fractional reserve banking, there would be a complete repricing of all assets. Probably farmland would be a relative winner and AI slop would trend to zero.