This number is a prime.

                                                       2021222324 2526272829

+ The only prime formed from all two-digit integers with the same first digit. [Silva]

+ The month of February in a leapyear is the only one whose last ten days can be written in the form of a prime string: 20212223242526272829. [Silva]

(There is one curio for this number that has not yet been approved by an editor.)

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