Alright, let's work through 25421182 times 40181997 step by step
25421182 × 40181997 = 40181997 × (25421182)
+ 40181997 × 2 what gives us 80363994
+ 40181997 × 80 which equals 3214559760
+ 40181997 × 100 resulting in 4018199700
+ 40181997 × 1000 which equals 40181997000
+ 40181997 × 20000 that results in 803639940000
+ 40181997 × 400000 giving us 16072798800000
+ 40181997 × 5000000 that is equal 200909985000000
+ 40181997 × 20000000 that results in 803639940000000

= 1021473858860454
