121111231111 has 8 divisors (see below), whose sum is σ = 130480554960. Its totient is φ = 111749489472.

The previous prime is 121111231009. The next prime is 121111231127. The reversal of 121111231111 is 111132111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121111231111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111231711) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1862350 + ... + 1926283.

It is an arithmetic number, because the mean of its divisors is an integer number (16310069370).

Almost surely, 2^121111231111 is an apocalyptic number.

121111231111 is a deficient number, since it is larger than the sum of its proper divisors (9369323849).

121111231111 is a wasteful number, since it uses less digits than its factorization.

121111231111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3791105.

The product of its digits is 12, while the sum is 16.

Adding to 121111231111 its reverse (111132111121), we get a palindrome (232243342232).

The spelling of 121111231111 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred thirty-one thousand, one hundred eleven".