I divisori di 21989990 sono 16, elencati qui di seguito: 1; 2; 5; 10; 11; 22; 55; 110; 199909; 399818; 999545; 1999090; 2198999; 4397998; 10994995; 21989990
21989971, 21989972, 21989973, 21989974, 21989975, 21989976, 21989977, 21989978, 21989979, 21989980, 21989981, 21989982, 21989983, 21989984, 21989985, 21989986, 21989987, 21989988, 21989989, 21989991, 21989992, 21989993, 21989994, 21989995, 21989996, 21989997, 21989998, 21989999, 21990000, 21990001, 21990002, 21990003, 21990004, 21990005, 21990006, 21990007, 21990008, 21990009