2111121211121 has 4 divisors (see below), whose sum is σ = 2273515150452. Its totient is φ = 1948727271792.

The previous prime is 2111121211079. The next prime is 2111121211163. The reversal of 2111121211121 is 1211121211112.

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

It is an interprime number because it is at equal distance from previous prime (2111121211079) and next prime (2111121211163).

It can be written as a sum of positive squares in 2 ways, for example, as 229187200225 + 1881934010896 = 478735^2 + 1371836^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111121211121 - 2¹⁰ = 2111121210097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2111121211121.

It is not an unprimeable number, because it can be changed into a prime (2111121213121) 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, 81196969646 + ... + 81196969671.

It is an arithmetic number, because the mean of its divisors is an integer number (568378787613).

Almost surely, 2^{2111121211121} is an apocalyptic number.

It is an amenable number.

2111121211121 is a deficient number, since it is larger than the sum of its proper divisors (162393939331).

2111121211121 is a wasteful number, since it uses less digits than its factorization.

2111121211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162393939330.

The product of its digits is 16, while the sum is 17.

Adding to 2111121211121 its reverse (1211121211112), we get a palindrome (3322242422233).

Subtracting from 2111121211121 its reverse (1211121211112), we obtain a palindrome (900000000009).

The spelling of 2111121211121 in words is "two trillion, one hundred eleven billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-one".