121112112111 has 4 divisors (see below), whose sum is σ = 161482816152. Its totient is φ = 80741408072.

The previous prime is 121112112109. The next prime is 121112112127. The reversal of 121112112111 is 111211211121.

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 121112112111 - 2¹ = 121112112109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121112112211) 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, 20185352016 + ... + 20185352021.

It is an arithmetic number, because the mean of its divisors is an integer number (40370704038).

Almost surely, 2^121112112111 is an apocalyptic number.

121112112111 is a deficient number, since it is larger than the sum of its proper divisors (40370704041).

121112112111 is an equidigital number, since it uses as much as digits as its factorization.

121112112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40370704040.

The product of its digits is 8, while the sum is 15.

Adding to 121112112111 its reverse (111211211121), we get a palindrome (232323323232).

The spelling of 121112112111 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred twelve thousand, one hundred eleven".