We discuss the production mechanism of fully charm tetraquark, observed
recently by the LHCb at M = 6.9 GeV in the $J/\psi J/\psi$ channel.
Both single parton scattering (SPS) and double parton scattering (DPS)
mechanisms are considered.
We calculate the distribution in the invariant
mass of the four-quark system $M_{4c}$ for SPS and DPS production of
$c c \bar c \bar c$ in the $k_t$-factorization approach.
We present transverse momentum distribution in $p_{t,4c}$
for $c \bar c c \bar c$ system in a mass window around tetraquark mass.
The calculation of the SPS
$g^* g^* \to T_{4c}(6900)$ fusion mechanism is performed in the
$k_T$-factorization approach assuming different spin scenarios ($0^+$
and $0^-$).