Adele's 21 is currently No. 1 on the Billboard 200 chart for the 12th week in row. Santana was the last artist to reach this point in late 1999 and early 2000. The album 21 has sold 2.9 million albums to date.
Nicki Minaj's "Super Bass" is now the highest-charting Billboard Hot 100 rap song by a female without the aide of another artist. Missy Elliot's "Work It" was the last song to do so in 2002 when it spent 10 weeks at No. 2. Considering every other rap song these days features another artist, I suppose the chances were much higher for Minaj to achieve this.
Speaking of Missy Elliot, Katy Perry's "Last Friday Night" remix featuring Elliot could potentially tie Perry with Michael Jackson for the most Billboard No. 1 singles from one album. Read more about this here.