Alright, let's work through 53445399 times 53239953 step by step
53445399 × 53239953 = 53239953 × (53445399)
+ 53239953 × 9 which equals 479159577
+ 53239953 × 90 that is equal 4791595770
+ 53239953 × 300 that is equal 15971985900
+ 53239953 × 5000 giving us 266199765000
+ 53239953 × 40000 that results in 2129598120000
+ 53239953 × 400000 that results in 21295981200000
+ 53239953 × 3000000 resulting in 159719859000000
+ 53239953 × 50000000 what gives us 2661997650000000

= 2845430530826247
