Paul uses irony here to shame the Corinthians and make them realize that they are sinning when they are proud of themselves and their teachers. (See: [[rc://en/ta/man/translate/figs-irony]])
God has displayed the apostles just like prisoners at the end of a Roman military parade, who are humiliated before their execution. (See: [[rc://en/ta/man/translate/figs-metaphor]])
Possible meanings are 1) "the world" consists of both supernatural ("angels") and natural ("human beings") or 2) the list consists of three items: "to the world, to angels, and to human beings." (See: [[rc://en/ta/man/translate/figs-merism]])