155521

This number is a prime.

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15:55:21 is the largest emirp time in hours, minutes and seconds whose earlier displayed reversal 12:55:51 shows up anew on a 24-hour digit clock when turned upside down. [Beedassy]

Submitted: 2010-04-22 05:54:58; Last Modified: 2010-04-22 23:31:43.