20111100100111 has 4 divisors (see below), whose sum is σ = 20111193937224. Its totient is φ = 20111006263000.

The previous prime is 20111100100079. The next prime is 20111100100123. The reversal of 20111100100111 is 11100100111102.

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 20111100100111 - 2⁵ = 20111100100079 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 (20111100130111) 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, 46596340 + ... + 47025961.

It is an arithmetic number, because the mean of its divisors is an integer number (5027798484306).

Almost surely, 2^{20111100100111} is an apocalyptic number.

20111100100111 is a deficient number, since it is larger than the sum of its proper divisors (93837113).

20111100100111 is an equidigital number, since it uses as much as digits as its factorization.

20111100100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93837112.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 20111100100111 its reverse (11100100111102), we get a palindrome (31211200211213).

The spelling of 20111100100111 in words is "twenty trillion, one hundred eleven billion, one hundred million, one hundred thousand, one hundred eleven".