Question for any arbitrageur outhere...

…Does anyone know the conversion ratio for Citi PFD? The conversion of 7.3 shares of C for each PFD looks like it’s not accurate, otherwise there is a huge arbitrage opportunity. For example CPRP closed at 12.82 but with an conversion ratio of 7.3 should be trading at 17. Does any arbitrageur out there knows what’s going on?