Surah Fatir are 45 ayaat and it was revealed in Makkah. In a narration from the Holy Prophet (P.U.H) it is said that three doors of Jannah will be opened for the person who recites this Surah. He will be able to enter it through whichever door he pleases. In another narration it is said that the eight doors of Jannah will open to him and he will be permitted to enter through whichever he likes.