Next prime | 29 |

Previous prime | 19 |

Octal | (27)_{8} |

Hexadecimal | (17)_{16} |

Prime gap | 6 |

6th Sexy prime (the small number) | The big number is 29 . |

5th Prime of the Form 4n+3 | |

5th Factorial prime | 4! - 1 |

5th Sophie Germain prime | |

4th Safe prime | |

7th Left-truncatable prime | |

5th Right-truncatable prime | |

5th Two-sided prime |