20111000111 has 16 divisors (see below), whose sum is σ = 20700911616. Its totient is φ = 19526917536.

The previous prime is 20111000101. The next prime is 20111000123. The reversal of 20111000111 is 11100011102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20111000111 - 2³⁴ = 2931130927 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 (20111000101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10192121 + ... + 10194093.

It is an arithmetic number, because the mean of its divisors is an integer number (1293806976).

Almost surely, 2^20111000111 is an apocalyptic number.

20111000111 is a deficient number, since it is larger than the sum of its proper divisors (589911505).

20111000111 is a wasteful number, since it uses less digits than its factorization.

20111000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 20111000111 its reverse (11100011102), we get a palindrome (31211011213).

The spelling of 20111000111 in words is "twenty billion, one hundred eleven million, one hundred eleven", and thus it is an aban number.