12111221111011 has 32 divisors (see below), whose sum is σ = 13496512356288. Its totient is φ = 10775699619840.

The previous prime is 12111221110993. The next prime is 12111221111027. The reversal of 12111221111011 is 11011112211121.

It is a cyclic number.

It is not a de Polignac number, because 12111221111011 - 2⁷ = 12111221110883 is a prime.

It is a super-5 number, since 5×12111221111011⁵ (a number of 67 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111221111071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285237295 + ... + 285279751.

It is an arithmetic number, because the mean of its divisors is an integer number (421766011134).

Almost surely, 2^{12111221111011} is an apocalyptic number.

12111221111011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12111221111011 is a deficient number, since it is larger than the sum of its proper divisors (1385291245277).

12111221111011 is a wasteful number, since it uses less digits than its factorization.

12111221111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45271.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 12111221111011 its reverse (11011112211121), we get a palindrome (23122333322132).

It can be divided in two parts, 121112211110 and 11, that added together give a palindrome (121112211121).

The spelling of 12111221111011 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-one million, one hundred eleven thousand, eleven".