  The hyperfine splitting in hydrogenlike $^{209}$Bi, $^{203}$Tl, and
$^{205}$Tl is calculated with the nuclear magnetization determined from
experimental data on the hyperfine splitting in the corresponding muonic atoms.
The single-particle and configuration-mixing nuclear models are considered. The
QED corrections are taken into account for both electronic and muonic atoms.
The obtained results are compared with other calculations and with experiment.
