Alright, let's work through 21504431 times 35395213 step by step
21504431 × 35395213 = 35395213 × (21504431)
+ 35395213 × 1 giving us 35395213
+ 35395213 × 30 that results in 1061856390
+ 35395213 × 400 giving us 14158085200
+ 35395213 × 4000 which equals 141580852000
+ 35395213 × 00000 that equals 0
+ 35395213 × 500000 giving us 17697606500000
+ 35395213 × 1000000 which equals 35395213000000
+ 35395213 × 20000000 what gives us 707904260000000

= 761153915688803
