111121211221211 has 16 divisors (see below), whose sum is σ = 114148435724928. Its totient is φ = 108121686019200.

The previous prime is 111121211221199. The next prime is 111121211221217. The reversal of 111121211221211 is 112122112121111.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111121211221211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111121211221217) 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, 135712901 + ... + 136529241.

It is an arithmetic number, because the mean of its divisors is an integer number (7134277232808).

Almost surely, 2^{111121211221211} is an apocalyptic number.

111121211221211 is a deficient number, since it is larger than the sum of its proper divisors (3027224503717).

111121211221211 is a wasteful number, since it uses less digits than its factorization.

111121211221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833302.

The product of its digits is 32, while the sum is 20.

Adding to 111121211221211 its reverse (112122112121111), we get a palindrome (223243323342322).

The spelling of 111121211221211 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".