Totti cancelled out Hernanes' opener when he slid in a 56th-minute penalty to draw level with Dino Da Costa and Marco Delvecchio's derby record of nine goals.
The 36-year-old, who leapt the advertising hoardings to celebrate in front of the fans, leads Roma's all-time appearance and goalscoring charts but claimed levelling the goal record against his side's fiercest rivals was his most cherished mark.
"I wanted (the record) so much. It is my most beautiful record," he told Sky Sport Italia.
Totti did admit, though, that failure to win left a sour taste.
Lazio were reduced to 10 men when Giuseppe Biava saw red on 69 minutes but the hosts failed to take advantage to leave them seventh, three points behind their city rivals.
"I wanted the win," said Totti, who drew a sharp low save from Lazio goalkeeper Federico Marchetti following a free-kick routine late on.
"We threw it away in the first half. Unfortunately we did not get into the game immediately and they put us under a lot of pressure."
Roma did ride their luck and could have been 2-0 down early in the second half only for Hernanes to put a penalty over the crossbar.
"Hernanes' miss changed the game and we did better after that," Totti said.