2111212211121 has 12 divisors (see below), whose sum is σ = 3284107884148. Its totient is φ = 1299207514464.

The previous prime is 2111212211113. The next prime is 2111212211137. The reversal of 2111212211121 is 1211122121112.

It is a happy number.

2111212211121 is a `hidden beast` number, since 211 + 121 + 2 + 211 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1135739935521 + 975472275600 = 1065711^2 + 987660^2 .

It is not a de Polignac number, because 2111212211121 - 2³ = 2111212211113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111212211094 and 2111212211103.

It is not an unprimeable number, because it can be changed into a prime (2111212211821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9022274290 + ... + 9022274523.

Almost surely, 2^{2111212211121} is an apocalyptic number.

It is an amenable number.

2111212211121 is a deficient number, since it is larger than the sum of its proper divisors (1172895673027).

2111212211121 is a wasteful number, since it uses less digits than its factorization.

2111212211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044548832 (or 18044548829 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 2111212211121 its reverse (1211122121112), we get a palindrome (3322334332233).

Subtracting from 2111212211121 its reverse (1211122121112), we obtain a palindrome (900090090009).

It can be divided in two parts, 211121 and 2211121, that added together give a palindrome (2422242).

The spelling of 2111212211121 in words is "two trillion, one hundred eleven billion, two hundred twelve million, two hundred eleven thousand, one hundred twenty-one".