I went to app world, mobile.blackberry.com and application center and it is not there! I think it was an accident that they have cleared up because it is still 1.6.0.21??? I guess consider yourself lucky if you go it?
did you follow the link I posted up? Go to that link from your phone and you have to click the download button, then select a language, and then the OTA download screen pops up. It has version # 1.6.0.22 listed there. I just checked it again.