121211311311 has 24 divisors (see below), whose sum is σ = 176722248560. Its totient is φ = 80051245056.

The previous prime is 121211311279. The next prime is 121211311313. The reversal of 121211311311 is 113113112121.

121211311311 is a `hidden beast` number, since 1 + 21 + 21 + 1 + 311 + 311 = 666.

It is not a de Polignac number, because 121211311311 - 2⁵ = 121211311279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211311313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8298831 + ... + 8313423.

Almost surely, 2^121211311311 is an apocalyptic number.

121211311311 is a deficient number, since it is larger than the sum of its proper divisors (55510937249).

121211311311 is a wasteful number, since it uses less digits than its factorization.

121211311311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23175 (or 23172 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

Adding to 121211311311 its reverse (113113112121), we get a palindrome (234324423432).

The spelling of 121211311311 in words is "one hundred twenty-one billion, two hundred eleven million, three hundred eleven thousand, three hundred eleven".