12111221112011 has 16 divisors (see below), whose sum is σ = 14715708493824. Its totient is φ = 9742344035424.

The previous prime is 12111221111999. The next prime is 12111221112037. The reversal of 12111221112011 is 11021112211121.

It is a de Polignac number, because none of the positive numbers 2^k-12111221112011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111221112091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709661051 + ... + 709678116.

It is an arithmetic number, because the mean of its divisors is an integer number (919731780864).

Almost surely, 2^{12111221112011} is an apocalyptic number.

12111221112011 is a deficient number, since it is larger than the sum of its proper divisors (2604487381813).

12111221112011 is a wasteful number, since it uses less digits than its factorization.

12111221112011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419339250.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12111221112011 its reverse (11021112211121), we get a palindrome (23132333323132).

The spelling of 12111221112011 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, eleven".