Nope. Think of it like the bonus you'd get from +5 full plate - the full plate itself gives +8 armor, and the +5 enhancement bonus on it improves that by 5. Here, the +21 is the base amount, corresponding to full plate's +8, and the +9 is the magical improvement to that.
You're forgetting that Monk AC bonus includes your wisdom ability bonus. Vesran's wisdom is 38, which gives a +14 bonus. Add +1 for the level 5 level-based component, and you get +15.
Open the "The bonuses and what buffs they come from" spoiler. Critical hits are listed in the "Immunities/resistances" section, with the spells Elemental Body, Heart of Air/Water/Earth/Fire, and Stone Body noted. Elemental Body and Stone Body each individually give crit immunity, and the combination of all four Heart of X spells also gives crit immunity.