20102112111 has 32 divisors (see below), whose sum is σ = 29265020928. Its totient is φ = 12224724480.

The previous prime is 20102112109. The next prime is 20102112131. The reversal of 20102112111 is 11121120102.

It is not a de Polignac number, because 20102112111 - 2¹ = 20102112109 is a prime.

It is a super-2 number, since 2×20102112111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102112101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 206181 + ... + 287601.

It is an arithmetic number, because the mean of its divisors is an integer number (914531904).

Almost surely, 2^20102112111 is an apocalyptic number.

20102112111 is a deficient number, since it is larger than the sum of its proper divisors (9162908817).

20102112111 is a wasteful number, since it uses less digits than its factorization.

20102112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81591.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20102112111 its reverse (11121120102), we get a palindrome (31223232213).

The spelling of 20102112111 in words is "twenty billion, one hundred two million, one hundred twelve thousand, one hundred eleven".