Contrary to what was said in a previous answer, this black hole would persist!
We will assume that its radius is of the order of that of an atom, therefore of an Angstrom ().
We further assume that the mass is spherically symmetrical and is homogeneous.
The Schwarzschild radius is given by:
We fix now (we assume that the ball of matter is “just” a black hole, ie that its Schwarzschild radius is exactly its physical radius).
So we have:
(surprising, no?)
It evaporates in one time:
seconds.
Either...incomparably longer than the age of the universe.
But I feel that the fan of Michael Bay's explosive films in you is not satisfied.
The power released by Hawking radiation you tell me?
Watts.
Nothing really impressive, sorry.
So there you go...you will have a black hole that will destroy everything mechanically, and that will last a very, very long time...in silence.
By engulfing the Earth, it will have multiplied its mass by approximately one million. Otherwise at the level of the Solar system...nothing special happens.
The moon is slightly more attracted and will follow orbits that are barely more elliptical (almost imperceptible).
Fast-forward over a few billion years:
As it grows, part of the Sun, a red giant to come, will become trapped there and the little black hole of nothing at all will gain mass to the point of consuming it entirely.
But until then nothing spectacular.
Congratulations...you ended humanity without even a small fireworks display