What does 2 Chronicles 11:21 mean?

Rehoboam loved Maacah, Absalom's daughter, more than any of his other wives and concubines. He had eighteen wives and sixty concubines, and fathered twenty-eight sons and sixty daughters. 2 Chronicles 11:21 - Modern Text Bible

(Rehoboam's family is huge, and he clearly favors Maacah and her children, which will matter for succession.)