How much health will a Life Domain cleric regain from the Blessed Healer feature using the Mass Healing Word spell?

This question could loosely be considered a follow up to “Can Goodberries heal a Life cleric when consumed by another.”

How much life would a level 6 Life Cleric with four party members gain from the Blessed Healer class attribute with a casting of Mass Healing Word?

Blessed Healer

Beginning at 6th level, the healing spells you cast on others heal you as well. When you cast a spell of 1st level or higher that restores hit points to a creature other than you, you regain hit points equal to 2 + the spell’s level.

Mass Healing Word

As you call out words of restoration, up to six creatures of your choice that you can see within range regain hit points equal to 1d4 + your spellcasting ability modifier. This spell has no effect on undead or constructs.

If the Cleric casts Mass Healing Word, targeting each of the 4 party members, how many times would the Cleric gain HP equal to 2 + Spell Level?

Taken further, would the Blessed Healer effect be prevented if the Cleric targeted himself with Mass Healing Word, in addition to the other 4 members of his party?