121212102111 has 16 divisors (see below), whose sum is σ = 167316019200. Its totient is φ = 77962357088.

The previous prime is 121212102049. The next prime is 121212102113. The reversal of 121212102111 is 111201212121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121212102111 - 2⁶ = 121212102047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212102113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413391 + ... + 642896.

It is an arithmetic number, because the mean of its divisors is an integer number (10457251200).

Almost surely, 2^121212102111 is an apocalyptic number.

121212102111 is a deficient number, since it is larger than the sum of its proper divisors (46103917089).

121212102111 is a wasteful number, since it uses less digits than its factorization.

121212102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057638.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121212102111 its reverse (111201212121), we get a palindrome (232413314232).

The spelling of 121212102111 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred two thousand, one hundred eleven".