The number 106 is arbitrary but has a rhythmic, almost proverbial sound in Italian. Other versions exist (e.g., "ce ne vogliono cento" — you need 100), but "106" stuck because it sounds more precise and humorous.
: While De André's songs frequently champion marginalized figures and unique women (like the protagonist in "Bocca di Rosa"), this specific line has become a popular shorthand in Italian social media and captions to describe a woman who stands out from the crowd. Themes of the "Paper" per una come lei ce ne voglion 106