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Actually, according to these two pages ->
http://www.seds.org/billa/twn/antx.html
http://www.astro.uiuc.edu/~kaler/sow/antares.html

Antares is roughly 700 ~ 900 times larger in diameter than the Sun, and 9 000 ~ 12 000 times more luminous. Antares A is one of the largest stars out there, along with Betelgeuse.