221212111305 has 32 divisors (see below), whose sum is σ = 354594820608. Its totient is φ = 117761529600.

The previous prime is 221212111279. The next prime is 221212111409. The reversal of 221212111305 is 503111212122.

It is not a de Polignac number, because 221212111305 - 2⁷ = 221212111177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19551600 + ... + 19562910.

It is an arithmetic number, because the mean of its divisors is an integer number (11081088144).

Almost surely, 2^221212111305 is an apocalyptic number.

It is an amenable number.

221212111305 is a deficient number, since it is larger than the sum of its proper divisors (133382709303).

221212111305 is a wasteful number, since it uses less digits than its factorization.

221212111305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13617.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 221212111305 its reverse (503111212122), we get a palindrome (724323323427).

The spelling of 221212111305 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred eleven thousand, three hundred five".