It will probably be something like a mule with an odd number of chromosomes.
Mules do have 63 chromosomes and are usually sterile. A chimp-human hybrid should, indeed, have 47 chromosomes. There are similar hybrids that are fully fertile, unlike mules: the cross between a Przewalski's horse and a domestic horse has 65 chromosomes, for instance.
And that's not what Cavediver was asking....
Edited by Coragyps, : clarity