I don't know for sure, but most likely it's a Pearl White. Possibly a white base coat with a pearl clearcoat or a white/pearl base with a standard clearcoat.
ColorRite is the only place I've seen that offers matching paint for cycles, but it's expensive and may not match that well. Any type of touch-up will be noticeable with this, or any metallic, type of paint.
You can try to touch it up yourself, but it will most likely end up looking worse than when you started. I suggest either getting it done by a professional body shop, who will paint the entire fairing or tank. If it's just a fairing, it will likely be less expensive to simply buy a new one.