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Here's one way for anyone who can better break it down for OP.

Determine the division of the circle (360º ÷ number of circles), Create center guides. With Ellipse Tool, create and position first circle. Copy/duplicate first circle, Select Move Tool!!.  Cmd + T, move rotation point to the center (guides), enter angle/degree of rotation then OK. Simple step and repeat > Shift + Option + Command + T 19 clicks (original+copy+19clicks = 21) .

Circle. Division 17.14

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21 circles equally spaced.........close enough! All in separate layers.

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Showing first 10.5...........but there are 21.

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