20112220111 has 4 divisors (see below), whose sum is σ = 20116483192. Its totient is φ = 20107957032.

The previous prime is 20112220069. The next prime is 20112220151. The reversal of 20112220111 is 11102221102.

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

It is a cyclic number.

It is not a de Polignac number, because 20112220111 - 2⁹ = 20112219599 is a prime.

It is a super-3 number, since 3×20112220111³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112220091 and 20112220100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112220151) 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, 2124456 + ... + 2133901.

It is an arithmetic number, because the mean of its divisors is an integer number (5029120798).

Almost surely, 2^20112220111 is an apocalyptic number.

20112220111 is a deficient number, since it is larger than the sum of its proper divisors (4263081).

20112220111 is an equidigital number, since it uses as much as digits as its factorization.

20112220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4263080.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20112220111 its reverse (11102221102), we get a palindrome (31214441213).

Subtracting from 20112220111 its reverse (11102221102), we obtain a palindrome (9009999009).

The spelling of 20112220111 in words is "twenty billion, one hundred twelve million, two hundred twenty thousand, one hundred eleven".