20111310111 has 4 divisors (see below), whose sum is σ = 26815080152. Its totient is φ = 13407540072.

The previous prime is 20111310073. The next prime is 20111310113. The reversal of 20111310111 is 11101311102.

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

It is not a de Polignac number, because 20111310111 - 2⁷ = 20111309983 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 (20111310113) 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, 3351885016 + ... + 3351885021.

It is an arithmetic number, because the mean of its divisors is an integer number (6703770038).

Almost surely, 2^20111310111 is an apocalyptic number.

20111310111 is a deficient number, since it is larger than the sum of its proper divisors (6703770041).

20111310111 is an equidigital number, since it uses as much as digits as its factorization.

20111310111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703770040.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 20111310111 its reverse (11101311102), we get a palindrome (31212621213).

Subtracting from 20111310111 its reverse (11101311102), we obtain a palindrome (9009999009).

The spelling of 20111310111 in words is "twenty billion, one hundred eleven million, three hundred ten thousand, one hundred eleven".