Without being featured, but also WITHOUT A FEATURE ARTIST. They COMPLETELY earned it themselves; even if the feature was a nobody. All fans buying it was because YOUR ARTIST.
Mariah Carey:
Vision of Love
Love Takes Time
Someday
I Don't Wanna Cry
Emotions
Dreamlover
Hero
Fantasy
Always Be My Baby
Honey
My All
We Belong Together
Don't Forget About Us
Touch My Body
14/18.
Mariah was NEVER featured in any of her 18 #1's though. I'll Be There had Trey Lorenz, One Sweet Day had Boyz II Men, Heartbreaker had Jay-Z, and Thank God I Found You had Joe/98 Degrees.