**The number you submitted to be crunched was:**

# 21 - twenty one

It is an odd number. It is not a palindrome. It is not a prime number. It is not a mersenne prime number. It is not a fermat number. It is not a perfect number. |

It is the 6th triangle number. It is not a square number. It is not a cube number. It is not a factorial number. |

It has the following factors: 21 7 3 1 |

Base 2 (Binary): | 1 0101 |

Base 3 (Ternary): | 210 |

Base 4 (Quaternary): | 111 |

Base 5 (Quintal): | 41 |

Base 8 (Octal): | 25 |

Base 10 (Denary): | 21 |

Base 16 (Hexadecimal): | 15 |

Roman Numerals: | XXI |

Egyptian Numerals: | 𓎇𓏺 |

Chinese Numerals: | 貳拾壹 |

Babylonian Numerals: |