2121021111121 has 64 divisors (see below), whose sum is σ = 2606826240000. Its totient is φ = 1700673408000.

The previous prime is 2121021111047. The next prime is 2121021111151. The reversal of 2121021111121 is 1211111201212.

It is a cyclic number.

It is not a de Polignac number, because 2121021111121 - 2⁹ = 2121021110609 is a prime.

It is a super-2 number, since 2×2121021111121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121021111095 and 2121021111104.

It is not an unprimeable number, because it can be changed into a prime (2121021111151) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 537918676 + ... + 537922618.

It is an arithmetic number, because the mean of its divisors is an integer number (40731660000).

Almost surely, 2^{2121021111121} is an apocalyptic number.

It is an amenable number.

2121021111121 is a deficient number, since it is larger than the sum of its proper divisors (485805128879).

2121021111121 is a wasteful number, since it uses less digits than its factorization.

2121021111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590.

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

Adding to 2121021111121 its reverse (1211111201212), we get a palindrome (3332132312333).

Subtracting from 2121021111121 its reverse (1211111201212), we obtain a palindrome (909909909909).

The spelling of 2121021111121 in words is "two trillion, one hundred twenty-one billion, twenty-one million, one hundred eleven thousand, one hundred twenty-one".