Daniel's Prince of Persia

Some people have said the the Prince of Persia in Daniel is the Satan. Well, if the oldest extant copy of the relevant portion of the book of Daniel is correct, then unless the Satan is several people, this interpretation is without literarary support.

The princes of the kingdom of Persia withstood me for twenty-one days; but Michael, one of the chief princes, came to help me, so I remained there with the kingdom of Persia and came to make you understand what is to befall your pepole in the later days. For the vision is for days to come.
--Daniel 10:13-14, 4QDan(c), The Dead Sea Scrolls Bible