What is the recommended microcontroller series that replaces the LPC213x series?

[bpdohertyman]

I am looking for a microcontroller that I could port an existing LPC2138 design to, preferably having USB support.

[vicentegomez]

There is no direct replacement for the LPC2xxx family  but depending on your application you can check the followings options 

LPC54xxx family

LPC55xxx family

or if you only need the USB you also can check the 

LPC51U68