Comic celebrities turned out for David Letterman’s late-night farewell — and so did his biggest audience in more than 21 years.

The Nielsen company said that 13.76 million viewers saw Letterman end his 33-year career as a late-night TV host with a final show Wednesday night. The last time Letterman had so many viewers was in February 1994, when his show aired after CBS’ telecast of the Winter Olympics.

More people watched Letterman than anything else in prime time on Wednesday night. Letterman’s final show started at 11.35pm and lasted more than an hour as CBS let it run long.

Jay Leno’s farewell last February was seen by 14.6 million viewers.