2121131311121 has 8 divisors (see below), whose sum is σ = 2233181025600. Its totient is φ = 2009122719120.

The previous prime is 2121131311097. The next prime is 2121131311127. The reversal of 2121131311121 is 1211131311212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121131311121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121131311093 and 2121131311102.

It is not an unprimeable number, because it can be changed into a prime (2121131311127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10174706 + ... + 10381083.

It is an arithmetic number, because the mean of its divisors is an integer number (279147628200).

Almost surely, 2^{2121131311121} is an apocalyptic number.

It is an amenable number.

2121131311121 is a deficient number, since it is larger than the sum of its proper divisors (112049714479).

2121131311121 is a wasteful number, since it uses less digits than its factorization.

2121131311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20561239.

The product of its digits is 72, while the sum is 20.

Adding to 2121131311121 its reverse (1211131311212), we get a palindrome (3332262622333).

Subtracting from 2121131311121 its reverse (1211131311212), we obtain a palindrome (909999999909).

The spelling of 2121131311121 in words is "two trillion, one hundred twenty-one billion, one hundred thirty-one million, three hundred eleven thousand, one hundred twenty-one".