121212202011111 has 24 divisors (see below), whose sum is σ = 178814099505600. Its totient is φ = 79086773615616.

The previous prime is 121212202010993. The next prime is 121212202011163. The reversal of 121212202011111 is 111110202212121.

It is a happy number.

121212202011111 is a `hidden beast` number, since 12 + 121 + 220 + 201 + 1 + 111 = 666.

It is not a de Polignac number, because 121212202011111 - 2¹⁴ = 121212201994727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212202091111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12819615 + ... + 20168463.

It is an arithmetic number, because the mean of its divisors is an integer number (7450587479400).

Almost surely, 2^{121212202011111} is an apocalyptic number.

121212202011111 is a deficient number, since it is larger than the sum of its proper divisors (57601897494489).

121212202011111 is a wasteful number, since it uses less digits than its factorization.

121212202011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7387895 (or 7387892 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121212202011111 its reverse (111110202212121), we get a palindrome (232322404223232).

The spelling of 121212202011111 in words is "one hundred twenty-one trillion, two hundred twelve billion, two hundred two million, eleven thousand, one hundred eleven".