No problem, we've got 21547005 and 17520157 to multiply
21547005 × 17520157 = 17520157 × (21547005)
+ 17520157 × 5 what gives us 87600785
+ 17520157 × 00 that results in 0
+ 17520157 × 000 which equals 0
+ 17520157 × 7000 giving us 122641099000
+ 17520157 × 40000 giving us 700806280000
+ 17520157 × 500000 what gives us 8760078500000
+ 17520157 × 1000000 that results in 17520157000000
+ 17520157 × 20000000 that equals 350403140000000

= 377506910479785
