>>15812533 lb
A possible solution?
Letter Number substution
12 01 12 14 12 15 12 14
L A L N L O L N
A N O N
Discard L's as an extraneous character?
Spells ANON
KM likely solution
[lots of real and slang definitions for this acronym]
(K +4 = KD)
(K +13 = KM)
(K +31 = k undefined or 31-26=5 K+5=KE)