20101112111 has 12 divisors (see below), whose sum is σ = 21283080624. Its totient is φ = 18981820800.

The previous prime is 20101112099. The next prime is 20101112117. The reversal of 20101112111 is 11121110102.

It is not a de Polignac number, because 20101112111 - 2¹⁰ = 20101111087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101112092 and 20101112101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101112117) 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, 22751 + ... + 201791.

It is an arithmetic number, because the mean of its divisors is an integer number (1773590052).

Almost surely, 2^20101112111 is an apocalyptic number.

20101112111 is a deficient number, since it is larger than the sum of its proper divisors (1181968513).

20101112111 is a wasteful number, since it uses less digits than its factorization.

20101112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179390 (or 179371 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20101112111 its reverse (11121110102), we get a palindrome (31222222213).

The spelling of 20101112111 in words is "twenty billion, one hundred one million, one hundred twelve thousand, one hundred eleven".