102111111111 has 4 divisors (see below), whose sum is σ = 136148148152. Its totient is φ = 68074074072.

The previous prime is 102111111107. The next prime is 102111111131. The reversal of 102111111111 is 111111111201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 102111111111 - 2² = 102111111107 is a prime.

It is a Duffinian number.

102111111111 is a modest number, since divided by 111111 gives 102111 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111111131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17018518516 + ... + 17018518521.

It is an arithmetic number, because the mean of its divisors is an integer number (34037037038).

Almost surely, 2^102111111111 is an apocalyptic number.

102111111111 is a deficient number, since it is larger than the sum of its proper divisors (34037037041).

102111111111 is an equidigital number, since it uses as much as digits as its factorization.

102111111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34037037040.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 102111111111 its reverse (111111111201), we get a palindrome (213222222312).

The spelling of 102111111111 in words is "one hundred two billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".