12111222212011 has 4 divisors (see below), whose sum is σ = 13042854689872. Its totient is φ = 11179589734152.

The previous prime is 12111222211969. The next prime is 12111222212123. The reversal of 12111222212011 is 11021222211121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12111222212011 - 2²⁷ = 12111087994283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12111222212011.

It is not an unprimeable number, because it can be changed into a prime (12111222212911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 465816238911 + ... + 465816238936.

It is an arithmetic number, because the mean of its divisors is an integer number (3260713672468).

Almost surely, 2^{12111222212011} is an apocalyptic number.

12111222212011 is a deficient number, since it is larger than the sum of its proper divisors (931632477861).

12111222212011 is an equidigital number, since it uses as much as digits as its factorization.

12111222212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931632477860.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12111222212011 its reverse (11021222211121), we get a palindrome (23132444423132).

The spelling of 12111222212011 in words is "twelve trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twelve thousand, eleven".