123123121110 has 48 divisors (see below), whose sum is σ = 349221946320. Its totient is φ = 29848029120.

The previous prime is 123123121097. The next prime is 123123121127. The reversal of 123123121110 is 11121321321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 62182405 + ... + 62184384.

It is an arithmetic number, because the mean of its divisors is an integer number (7275457215).

Almost surely, 2^123123121110 is an apocalyptic number.

123123121110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123123121110 is an abundant number, since it is smaller than the sum of its proper divisors (226098825210).

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

123123121110 is a wasteful number, since it uses less digits than its factorization.

123123121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124366813 (or 124366810 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 123123121110 its reverse (11121321321), we get a palindrome (134244442431).

The spelling of 123123121110 in words is "one hundred twenty-three billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred ten".