How many grains of sand are in the visible universe

chatGPT didnt get it, and answered wrong. so i pieced together the responses.

but its 1.2*10^51

1.2 sextendecillion

120,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

= 10^23*7.5*10^18*1.6*10^9

= planets * galaxies * grains of sand