Incorrect spelling, explanation: this form is incorrect, since th is not used with ordinal number third. The correct ending here is rd, so the correct form of this number is 53rd.
53th is incorrect and the only correct form is 53rd.
Correct spelling, explanation: form 53rd is the correct one, because there is 3rd at the end of this number, and as we always get the ordinal number suffix from its word-form, there is rd at the end of fifty-third. At the same time
53th is incorrect, as th is not a suffix for third. Therefore the only correct form is 53rd.
Definition of 53rd:
numeral, ordinal number between 52nd and 54th
It’s this company’s 53rd anniversary this year.
I’m 53rd in the queue to get to this office.
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