2111122432121 has 4 divisors (see below), whose sum is σ = 2145730996644. Its totient is φ = 2076513867600.

The previous prime is 2111122432099. The next prime is 2111122432129. The reversal of 2111122432121 is 1212342211112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 650505158521 + 1460617273600 = 806539^2 + 1208560^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111122432121 - 2²² = 2111118237817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111122432129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17304282170 + ... + 17304282291.

It is an arithmetic number, because the mean of its divisors is an integer number (536432749161).

Almost surely, 2^{2111122432121} is an apocalyptic number.

It is an amenable number.

2111122432121 is a deficient number, since it is larger than the sum of its proper divisors (34608564523).

2111122432121 is an equidigital number, since it uses as much as digits as its factorization.

2111122432121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34608564522.

The product of its digits is 384, while the sum is 23.

Adding to 2111122432121 its reverse (1212342211112), we get a palindrome (3323464643233).

The spelling of 2111122432121 in words is "two trillion, one hundred eleven billion, one hundred twenty-two million, four hundred thirty-two thousand, one hundred twenty-one".