20112111100111 has 4 divisors (see below), whose sum is σ = 20135689191352. Its totient is φ = 20088533008872.

The previous prime is 20112111100063. The next prime is 20112111100117. The reversal of 20112111100111 is 11100111121102.

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 20112111100111 - 2⁹ = 20112111099599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112111100091 and 20112111100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112111100117) 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, 11789044341 + ... + 11789046046.

It is an arithmetic number, because the mean of its divisors is an integer number (5033922297838).

Almost surely, 2^{20112111100111} is an apocalyptic number.

20112111100111 is a deficient number, since it is larger than the sum of its proper divisors (23578091241).

20112111100111 is an equidigital number, since it uses as much as digits as its factorization.

20112111100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23578091240.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 20112111100111 its reverse (11100111121102), we get a palindrome (31212222221213).

The spelling of 20112111100111 in words is "twenty trillion, one hundred twelve billion, one hundred eleven million, one hundred thousand, one hundred eleven".