2112021111121 has 4 divisors (see below), whose sum is σ = 2131397451700. Its totient is φ = 2092644770544.

The previous prime is 2112021111077. The next prime is 2112021111157. The reversal of 2112021111121 is 1211111202112.

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 1882877952400 + 229143158721 = 1372180^2 + 478689^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112021111121 - 2¹¹ = 2112021109073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2112021111095 and 2112021111104.

It is not an unprimeable number, because it can be changed into a prime (2112021111181) 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, 9688170126 + ... + 9688170343.

It is an arithmetic number, because the mean of its divisors is an integer number (532849362925).

Almost surely, 2^{2112021111121} is an apocalyptic number.

It is an amenable number.

2112021111121 is a deficient number, since it is larger than the sum of its proper divisors (19376340579).

2112021111121 is a wasteful number, since it uses less digits than its factorization.

2112021111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19376340578.

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

Adding to 2112021111121 its reverse (1211111202112), we get a palindrome (3323132313233).

Subtracting from 2112021111121 its reverse (1211111202112), we obtain a palindrome (900909909009).

The spelling of 2112021111121 in words is "two trillion, one hundred twelve billion, twenty-one million, one hundred eleven thousand, one hundred twenty-one".