20212112111 has 4 divisors (see below), whose sum is σ = 20212464192. Its totient is φ = 20211760032.

The previous prime is 20212112101. The next prime is 20212112119. The reversal of 20212112111 is 11121121202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212112111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212112119) 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, 67706 + ... + 212151.

It is an arithmetic number, because the mean of its divisors is an integer number (5053116048).

Almost surely, 2^20212112111 is an apocalyptic number.

20212112111 is a deficient number, since it is larger than the sum of its proper divisors (352081).

20212112111 is an equidigital number, since it uses as much as digits as its factorization.

20212112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352080.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20212112111 its reverse (11121121202), we get a palindrome (31333233313).

Subtracting from 20212112111 its reverse (11121121202), we obtain a palindrome (9090990909).

The spelling of 20212112111 in words is "twenty billion, two hundred twelve million, one hundred twelve thousand, one hundred eleven".