Base | Representation |
---|---|

bin | 101000011110… |

… | …1111011111100 |

3 | 1110221100111222 |

4 | 1100331323330 |

5 | 20413201322 |

6 | 2034532512 |

7 | 345261041 |

oct | 120757374 |

9 | 43840458 |

10 | 21225212 |

11 | 10a878a8 |

12 | 7137138 |

13 | 4521cc8 |

14 | 2b671c8 |

15 | 1ce3e42 |

hex | 143defc |

21225212 has 12 divisors (see below), whose sum is σ = 37213176. Its totient is φ = 10592880.

The previous prime is 21225209. The next prime is 21225229. The reversal of 21225212 is 21252212.

Adding to 21225212 its reverse (21252212), we get a palindrome (42477424).

Subtracting 21225212 from its reverse (21252212), we obtain a cube (27000 = 30^{3}).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2363 + ... + 6930.

It is an arithmetic number, because the mean of its divisors is an integer number (3101098).

Almost surely, 2^{21225212} is an apocalyptic number.

It is an amenable number.

21225212 is a deficient number, since it is larger than the sum of its proper divisors (15987964).

21225212 is a wasteful number, since it uses less digits than its factorization.

21225212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9868 (or 9866 counting only the distinct ones).

The product of its digits is 160, while the sum is 17.

The square root of 21225212 is about 4607.0828080251. The cubic root of 21225212 is about 276.8751712874.

The spelling of 21225212 in words is "twenty-one million, two hundred twenty-five thousand, two hundred twelve".

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