Alright, let's work through 25321493 times 21234380 step by step
25321493 × 21234380 = 21234380 × (25321493)
+ 21234380 × 3 resulting in 63703140
+ 21234380 × 90 that equals 1911094200
+ 21234380 × 400 that equals 8493752000
+ 21234380 × 1000 that results in 21234380000
+ 21234380 × 20000 giving us 424687600000
+ 21234380 × 300000 which equals 6370314000000
+ 21234380 × 5000000 yielding 106171900000000
+ 21234380 × 20000000 yielding 424687600000000

= 537686204529340
