SEATTLE — His jersey soaked, his postgame interviews done, Phil Humber took a little walk at empty Safeco Field.

It was about 45 minutes after his final pitch. The Chicago White Sox righty emerged from the dugout and strolled alone toward the left-field fence, where the totals were still showing on the hand-operated scoreboard.

All zeros.

“It’s probably something you’re not going to come by more than once in a lifetime,” Humber said Sunday, a day after he pitched the 21st perfect game in the major leagues and beat Seattle 4-0. “Just trying to take it all in and appreciate it and share it with my teammates.”

“I’m overwhelmed to be a part of history in that way and never thought it would happen to me,” he said.

Humber had plenty of work left to do when he got back to the hotel, too. He returned each of the 100-plus text messages he received. He also listened to the countless phone calls of congratulations, and managed to get to sleep by 1:30 a.m.

Humber was back to work on Sunday, going through his usual post-start routine and getting ready for his next outing, at home against the Boston Red Sox on Thursday.

“I’ve got to pitch in four days. It’s not like the season is over and you can kind of just go home and think about it,” Humber said.

A week ago, Humber was dealing with the heartache of losing his grandfather. He was unable to attend the funeral as his wife, Kristan, is due next month with their first child.

“Last week was kind of a downer for us,” Humber said. “That was tough.”

It hasn’t been an easy road for Humber on the field, either. He’s already on his fourth team in seven years in the majors. He had Tommy John surgery before his major league career even got started and didn’t get a chance to be a starter until his joined the White Sox last season.