12120111111121 has 16 divisors (see below), whose sum is σ = 13267281539008. Its totient is φ = 11004139396800.

The previous prime is 12120111111061. The next prime is 12120111111137. The reversal of 12120111111121 is 12111111102121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12120111111121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120111111095 and 12120111111104.

It is not an unprimeable number, because it can be changed into a prime (12120111111151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9950115 + ... + 11101576.

It is an arithmetic number, because the mean of its divisors is an integer number (829205096188).

Almost surely, 2^{12120111111121} is an apocalyptic number.

It is an amenable number.

12120111111121 is a deficient number, since it is larger than the sum of its proper divisors (1147170427887).

12120111111121 is a wasteful number, since it uses less digits than its factorization.

12120111111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21052432.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 12120111111121 its reverse (12111111102121), we get a palindrome (24231222213242).

The spelling of 12120111111121 in words is "twelve trillion, one hundred twenty billion, one hundred eleven million, one hundred eleven thousand, one hundred twenty-one".