  We examine lepton number violation (LNV) in theories with a saturated black
hole bound on a large number of species. Such theories have been advocated
recently as a possible solution to the hierarchy problem and an explanation of
the smallness of neutrino masses. The violation of lepton number can be a
potential phenomenological problem of this N-copy extension of the Standard
Model as due to the low quantum gravity scale black holes may induce TeV scale
LNV operators generating unacceptably large rates of LNV processes. We show,
however, that this does not happen in this scenario due to a specific
compensation mechanism between contributions of different Majorana neutrino
states to these processes. As a result rates of LNV processes are extremely
small and far beyond experimental reach, at least for the left-handed neutrino
states.
