Alright, let's work through 8721 times 1011 step by step
8721 × 1011 = 1011 × (8721)
+ 1011 × 1 what gives us 1011
+ 1011 × 20 which equals 20220
+ 1011 × 700 which equals 707700
+ 1011 × 8000 that equals 8088000

= 8816931
