121212012210111 has 24 divisors (see below), whose sum is σ = 181231892335104. Its totient is φ = 78004921216320.

The previous prime is 121212012210067. The next prime is 121212012210137. The reversal of 121212012210111 is 111012210212121.

It is a happy number.

121212012210111 is a `hidden beast` number, since 1 + 212 + 120 + 1 + 221 + 0 + 111 = 666.

It is not a de Polignac number, because 121212012210111 - 2¹⁰ = 121212012209087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212012212111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1433028720 + ... + 1433113301.

It is an arithmetic number, because the mean of its divisors is an integer number (7551328847296).

Almost surely, 2^{121212012210111} is an apocalyptic number.

121212012210111 is a deficient number, since it is larger than the sum of its proper divisors (60019880124993).

121212012210111 is a wasteful number, since it uses less digits than its factorization.

121212012210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866142191 (or 2866142188 counting only the distinct ones).

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

Adding to 121212012210111 its reverse (111012210212121), we get a palindrome (232224222422232).

The spelling of 121212012210111 in words is "one hundred twenty-one trillion, two hundred twelve billion, twelve million, two hundred ten thousand, one hundred eleven".