12120121222111 has 16 divisors (see below), whose sum is σ = 14666518857024. Its totient is φ = 9777474330624.

The previous prime is 12120121222081. The next prime is 12120121222147. The reversal of 12120121222111 is 11122212102121.

It is a happy number.

It is not a de Polignac number, because 12120121222111 - 2²⁷ = 12119987004383 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 (12120121232111) 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, 12127771 + ... + 13089043.

It is an arithmetic number, because the mean of its divisors is an integer number (916657428564).

Almost surely, 2^{12120121222111} is an apocalyptic number.

12120121222111 is a deficient number, since it is larger than the sum of its proper divisors (2546397634913).

12120121222111 is a wasteful number, since it uses less digits than its factorization.

12120121222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067250.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12120121222111 its reverse (11122212102121), we get a palindrome (23242333324232).

The spelling of 12120121222111 in words is "twelve trillion, one hundred twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".