1021

This number is a prime.

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The smallest emirp containing three consecutive digits. [Loungrides]

The smallest emirp formed from the concatenation of first four Fibonacci numbers, i.e., 0, 1, 1, 2. [Loungrides]

The smallest 4-digit prime (emirp) whose difference of the two left most digits (1 and 0) equals the difference of the two rightmost digits (2 and 1). [Loungrides]

The smallest term in the only case of four emirps, (1021, 3023, 7027, 9029), formed by inserting the same 2-digit number ab, between the digits of a 2-digit repdigit number dd, where d is each of the ending digits of a multi-digit prime, i.e., inserting 02 between the digits of 11, 33, 77, 99. [Loungrides]