Some interesting aspects:
52 Trillion zeros = 0, just with unnecessarily many digits.
Plutonium, cobalt and barium melt (and boil!) at temperatures considerably lower than 4000°C.
Turning 1kg of water at 100°C into 1kg of steam at 100°C requires 2256kJ of energy, so if you want to vaporize 1kg of water every second, you need 2,256MW of thermal power. Pu-238 produces a decay heat of approximately 570W/kg, so you'll need 4000kg of Pu-238 to produce a mass flow of 1kg/s of steam.
And no, I don't have anything better to do in the evening than to disprove trolls/nutjobs on youtube.