The only whale that could swallow a human is a sperm whale. It swallows giant squid.
The other toothed whales are not large enough to swallow a person without biting pieces off. The other large whales are all baleen whales that eat krill and their esophagus is too small.
A sperm whale cannot chew its prey so its first stomach chamber crushes up anything it eats. The other chambers dissolve the food. You would be suffocated, crushed, and dissolved if a sperm whale swallowed you.
