12111211121121 has 48 divisors (see below), whose sum is σ = 20147906009088. Its totient is φ = 6867120405600.

The previous prime is 12111211121117. The next prime is 12111211121123. The reversal of 12111211121121 is 12112111211121.

12111211121121 is a `hidden beast` number, since 1 + 211 + 1 + 211 + 121 + 121 = 666.

It is not a de Polignac number, because 12111211121121 - 2² = 12111211121117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111211121094 and 12111211121103.

It is not an unprimeable number, because it can be changed into a prime (12111211121123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81391030 + ... + 81539696.

It is an arithmetic number, because the mean of its divisors is an integer number (419748041856).

Almost surely, 2^{12111211121121} is an apocalyptic number.

It is an amenable number.

12111211121121 is a deficient number, since it is larger than the sum of its proper divisors (8036694887967).

12111211121121 is a wasteful number, since it uses less digits than its factorization.

12111211121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158682 (or 158679 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 12111211121121 its reverse (12112111211121), we get a palindrome (24223322332242).

It can be divided in two parts, 12111211121 and 121, that multiplied together give a palindrome (1465456545641).

The spelling of 12111211121121 in words is "twelve trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".