111211

This number is a prime.

+ The first prime (emirp) of form aba, where a, b are successive double-digit numbers. [Loungrides]

+ The first prime formed by inserting a composite number between two double-digit identical adjacent primes is an emirp. [Loungrides]

+ The largest near repunit prime in the first 1000 digits of Golden Ratio. It starts at position 644 after the decimal point. [Gupta]

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