Miniature black holes left over from the big-bang beginning of the universe, tiny black holes might still

Question:

Miniature black holes left over from the big-bang beginning of the universe, tiny black holes might still wander through the universe. If one with a mass of 1 x 1011 kg (and radius of only 1 x 10-16 m) reached Earth, at what distance from your head would its gravitational pull on you match that of Earth's?