Is "atopian" a typo, or are you referring to something distinct from utopian and dystopian? In trying to do a Google search on the topic (which is difficult because there is a presumably unrelated medical condition called atopy which relates to hyperallergic reactions), I ran across this article, but I'm still not certain what atopian means. These are some relevant excerpts I could find (from that article):

Rather than a timeless utopian ideal where history ends, rather than the allotted hour of the heterotopian, everyday life now pulses constantly with moments of unrealized atopian promise. Everywhere, all the time, the game confronts the rival impulses of chance and competition, intoxication and spectacle, as homeopathic antidotes to a boredom that challenges being from within.

Atopia has one quality in common with utopia—its aversion to ambiguity.

By excluding relations, utopia excludes violence; by privileging relations, atopia appears as nothing but violence, but only because it excludes instead any commitment to stable description.

If in utopia everything is subordinated to a rigorous description, a marking of space with signs, in atopia nothing matters but the transitive relations between variables.

Here is a literal definition:

It is not "nowhere" (utopia) or "elsewhere" (heterotopia), but "everywhere" (atopia). Far from being new-fangled neologism, "atopian" is a word Plato used to describe the philosophical cruising of his Socrates, passing in and out of various niches of Athenian life, playing illicit word-games with the champions of each.

There's more, for those who are interested.