Alternating Even-Odd Digit Palindromic Prime

Theorem
Let the notation $\paren {abc}_n$ be interpreted to mean $n$ consecutive repetitions of a string of digits $abc$ concatenated in the decimal representation of an integer.

The integer:


 * $\paren {10987654321234567890}_{42} 1$

has the following properties:
 * it is a palindromic prime with $841$ digits
 * its digits are alternately odd and even.

Proof
This number has $20 \times 42 + 1 = 841$ digits.

The remaining properties of this number is obvious by inspection.