121212112311 has 56 divisors (see below), whose sum is σ = 189106488000. Its totient is φ = 77595350976.

The previous prime is 121212112291. The next prime is 121212112339. The reversal of 121212112311 is 113211212121.

It is a happy number.

121212112311 is a `hidden beast` number, since 121 + 21 + 211 + 2 + 311 = 666.

It is not a de Polignac number, because 121212112311 - 2¹⁹ = 121211588023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212112361) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1782565 + ... + 1849313.

Almost surely, 2^121212112311 is an apocalyptic number.

121212112311 is a deficient number, since it is larger than the sum of its proper divisors (67894375689).

121212112311 is an frugal number, since it uses more digits than its factorization.

121212112311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66867 (or 66852 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 121212112311 its reverse (113211212121), we get a palindrome (234423324432).

The spelling of 121212112311 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, three hundred eleven".