Alright, let's work through 25053511 times 42012445 step by step
25053511 × 42012445 = 42012445 × (25053511)
+ 42012445 × 1 what gives us 42012445
+ 42012445 × 10 producing 420124450
+ 42012445 × 500 what gives us 21006222500
+ 42012445 × 3000 what gives us 126037335000
+ 42012445 × 50000 giving us 2100622250000
+ 42012445 × 000000 which equals 0
+ 42012445 × 5000000 giving us 210062225000000
+ 42012445 × 20000000 producing 840248900000000

= 1052559252944395
