12111222215105 has 32 divisors (see below), whose sum is σ = 16231914669600. Its totient is φ = 8613517473792.

The previous prime is 12111222215089. The next prime is 12111222215129. The reversal of 12111222215105 is 50151222211121.

It can be written as a sum of positive squares in 16 ways, for example, as 842048487424 + 11269173727681 = 917632^2 + 3356959^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111222215105 - 2⁴ = 12111222215089 is a prime.

It is a super-2 number, since 2×12111222215105² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7343660 + ... + 8840349.

It is an arithmetic number, because the mean of its divisors is an integer number (507247333425).

Almost surely, 2^{12111222215105} is an apocalyptic number.

It is an amenable number.

12111222215105 is a deficient number, since it is larger than the sum of its proper divisors (4120692454495).

12111222215105 is a wasteful number, since it uses less digits than its factorization.

12111222215105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16184453.

The product of its (nonzero) digits is 800, while the sum is 26.

Adding to 12111222215105 its reverse (50151222211121), we get a palindrome (62262444426226).

The spelling of 12111222215105 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-two million, two hundred fifteen thousand, one hundred five".