ATLAS results on charmonium production, $B_c$ production and exotic heavy hadrons

Recent results from the ATLAS experiment on the charmonium production, B_c production and exotic heavy hadrons will be presented. The measurement of J/psi and psi(2S) differential cross sections at large transverse momentum values in proton-proton collisions at 13 TeV will be reported. The measurement of the ratios of the B_c+ and B+ production cross sections in proton-proton collisions at 8 TeV will be discussed. Studies of the Pentaquarks with hidden charm in the Lambda_b decays in proton-proton collisions at 7 - 8 TeV will also be reported.