20100000111111 has 12 divisors (see below), whose sum is σ = 29033373699720. Its totient is φ = 13399981517520.

The previous prime is 20100000111101. The next prime is 20100000111137. The reversal of 20100000111111 is 11111100000102.

It is not a de Polignac number, because 20100000111111 - 2⁹ = 20100000110599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20100000111093 and 20100000111102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100000111101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9368560 + ... + 11312378.

It is an arithmetic number, because the mean of its divisors is an integer number (2419447808310).

Almost surely, 2^{20100000111111} is an apocalyptic number.

20100000111111 is a deficient number, since it is larger than the sum of its proper divisors (8933373588609).

20100000111111 is a wasteful number, since it uses less digits than its factorization.

20100000111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3092766 (or 3092763 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 20100000111111 its reverse (11111100000102), we get a palindrome (31211100111213).

The spelling of 20100000111111 in words is "twenty trillion, one hundred billion, one hundred eleven thousand, one hundred eleven".