Db 13sus4, 5th inversion (A# in the bass)
Also written as Db13sus4/A#.
Notes, from the bass up
A# (bass)C#F#G#BD#
The same notes as Db 13sus4 (A#, C#, F#, G#, B and D#), rearranged so A# is the lowest note. Use it to move between chords with smaller jumps across the keyboard.