1, 11, 2112111231131221, find the rule and fill in the number represented by "?" Friends, for your IQ to discuss it!

1, 11, 2112111231131221, find the rule and fill in the number represented by "?" Friends, for your IQ to discuss it!

one hundred and thirty-two thousand two hundred and thirty-one
11,21,1211,1231,131221,132231,232221,134211,...