Review your own paper in Mathematics I sent a paper to a good journal with other coauthors. Some days ago, one of my coauthors was sent an invitation to review this paper. Is this logical? I mean, has anybody of you ever received an invitation to review your own paper?

Some months ago, the same occurred with another paper in another good journal. I declined the invitation explaining that I was an author and I suggested other reviewers. 

But, as I got a similar invitation now, I ask whether this is a usual practice...
It's absolutely not usual practice and a clear case of the editor in charge being asleep at the wheel. This should not be happening: An editor's job is to find impartial reviewers and asking an author (or even someone close to the author) is definitely failing at this job.

Just the same, it is unethical for you to accept such invitations. Politely point out that you are an author of the paper and that, therefore, it would clearly be a conflict of interest for you to review the paper.