121201112111 has 16 divisors (see below), whose sum is σ = 131376683808. Its totient is φ = 111394944000.

The previous prime is 121201112033. The next prime is 121201112143. The reversal of 121201112111 is 111211102121.

It is a cyclic number.

It is not a de Polignac number, because 121201112111 - 2²⁶ = 121134003247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201112171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358145 + ... + 608826.

It is an arithmetic number, because the mean of its divisors is an integer number (8211042738).

Almost surely, 2^121201112111 is an apocalyptic number.

121201112111 is a deficient number, since it is larger than the sum of its proper divisors (10175571697).

121201112111 is a wasteful number, since it uses less digits than its factorization.

121201112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967162.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121201112111 its reverse (111211102121), we get a palindrome (232412214232).

The spelling of 121201112111 in words is "one hundred twenty-one billion, two hundred one million, one hundred twelve thousand, one hundred eleven".