10^3 * 11^4 * 12^5 = (2*5)^3 * 11^4 * (2^2*3)^5 = 2^3 * 5^3 * 11^4 * 2^10 * 3^5 = 2^13 * 3^5 * 5^3 * 11^4,
(13+1)(5+1)(3+1)(4+1)=14*6*4*5=1680
10^3 * 11^4 * 12^5 = (2*5)^3 * 11^4 * (2^2*3)^5 = 2^3 * 5^3 * 11^4 * 2^10 * 3^5 = 2^13 * 3^5 * 5^3 * 11^4,
(13+1)(5+1)(3+1)(4+1)=14*6*4*5=1680