123111102012 has 48 divisors (see below), whose sum is σ = 296254328832. Its totient is φ = 39767051520.

The previous prime is 123111101989. The next prime is 123111102017. The reversal of 123111102012 is 210201111321.

It is a junction number, because it is equal to n+sod(n) for n = 123111101982 and 123111102000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123111102017) 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, 873789 + ... + 1004852.

It is an arithmetic number, because the mean of its divisors is an integer number (6171965184).

Almost surely, 2^123111102012 is an apocalyptic number.

123111102012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123111102012 is an abundant number, since it is smaller than the sum of its proper divisors (173143226820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123111102012 is a wasteful number, since it uses less digits than its factorization.

123111102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878818 (or 1878816 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 123111102012 its reverse (210201111321), we get a palindrome (333312213333).

The spelling of 123111102012 in words is "one hundred twenty-three billion, one hundred eleven million, one hundred two thousand, twelve".