DJ Ella is making a playlist for an mp3 player; she is trying to decide what 9 9 songs to play and in what order they should be played. If she has her choices narrowed down to 21 21 hip-hop, 18 18 pop, and 15 15 disco songs, and she wants to play an equal number of hip-hop, pop, and disco songs, how many different playlists are possible? Express your answer in scientific notation rounding to the hundredths place.