The Coulomb energy difference of mirror nuclei is parametrized in terms of charge radii with further consideration of deformation and shell effects, in addition to the odd-even effect originated from the pairing phenomenon between the last two protons. With only three parameters, we arrive at a very simple mass relations of mirror nuclei, with the root-mean-square deviation of only 63 keV for nuclei with proton number $Z>10$, without resorting to any statistical correlations. Predicted mass values of proton-rich nuclei (including some of the unbound systems) are tabulated as Supplemental Material of this paper.

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• Binding energy & masses
• Coulomb energies & analogue states