  Lateral distributions of electrons in air showers initiated by photons of
ultra high energies ($10^{18}-10^{22}$ eV) obtained on the basis of numerical
solution of adjoint cascade equations are presented. An extended analysis has
been made considering separately the Landau-Pomeranchuk-Migdal (LPM) effect and
the interaction of photons and electrons with the geomagnetic field (GMF) with
respect to the scaling formalism for lateral distributions. It is shown that
one-parametric scaling description of the lateral distribution of electrons
remains valid up to the highest energies considering the LPM and GMF effects,
that allow effective primary particle type discrimination using the surface
detectors data of largest ground-based air shower arrays.
