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

Recent results from the ATLAS experiment on the charmonium production, Bc production and decays, 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 Bc+ and B+ production cross sections in proton-proton collisions at 8 TeV will be discussed. New results on the Bc decays to J/psi Ds(*) final states obtained with the whole Run 2 data at 13 TeV will be shown. Studies of the Pentaquarks with hidden charm in the Lambda_b decays in proton-proton collisions at 7 - 8 TeV will also be reported.