https://www.gamespot.com/articles/fortnite-on-android-now-available-without-an-invit/1100-6462461/

Fortnite is now available on Android without bothering with an invite. The beta had previously been invite-only, but as of today you can download it to any Android device for free, without waiting. In the announcement, Epic directed users to the official site for the download.

Epic accompanied the announcement with recommended system specs for your Android device to get the optimal experience. You can check the list of supported devices to make sure yours fits the bill.