Alright, let's work through 21428621 times 91618226 step by step
21428621 × 91618226 = 91618226 × (21428621)
+ 91618226 × 1 which equals 91618226
+ 91618226 × 20 yielding 1832364520
+ 91618226 × 600 that is equal 54970935600
+ 91618226 × 8000 yielding 732945808000
+ 91618226 × 20000 that is equal 1832364520000
+ 91618226 × 400000 that is equal 36647290400000
+ 91618226 × 1000000 that is equal 91618226000000
+ 91618226 × 20000000 giving us 1832364520000000

= 1963252241646346
