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In page Schwarzschild radius:

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A small mass has an extremely small Schwarzschild radius. A black hole of mass similar to that of Mount Everest,[1] 6.3715×1014 kg, would have a Schwarzschild radius much smaller than a nanometre. The Schwarzschild radius would be 2 × 6.6738×10−11 m3⋅kg−1⋅s−2 × 6.3715×1014 kg / (299792458 m⋅s−1)2 = 9.46×10−13 m = 9.46×10−4 nm. Its average density at that size would be so high that no known mechanism could form such extremely compact objects. Such black holes might possibly have been formed in an early stage of the evolution of the universe, just after the Big Bang, when densities of matter were extremely high. Therefore, these hypothetical miniature black holes are called primordial black holes.[citation needed]