The former Take That star, 46, lives in the sprawling property with his wife Ayda Field, 41, and their four children.
On BBC Radio 1, the Stoke-on-Trent-born star joked about how he planned to use them.
He said: “I am in Los Angeles in the hills of Beverlyshire 90210. I just wanted to experience it and now I’ve experienced it, I’m going back to Stoke.”
Asked how many toilets the house had, he said: “Twenty-seven. Yeah, 27 actual toilets.
“One day I’m going to have a poo party where people come round and we just flush them all, like synchronise it and see what happens.”
The singer also updated fans on his songwriting efforts during lockdown.
“I have written 25 new songs in the last three weeks,” he said.
“I have been doing art and I have got a garage full of massive paintings that I’ll be doing (an) exhibition (for).
“I’m organising a few TV shows that I’m gonna be doing. I’m very, very busy.”
Asked which shows, he joked: “I can’t say, but I have been asked to be a contestant on Naked Attraction. I’ve asked my wife and she says, ‘Yeah, it’s fine’.”
