123216427138 has 16 divisors (see below), whose sum is σ = 215538940800. Its totient is φ = 52807039908.

The previous prime is 123216427129. The next prime is 123216427153. The reversal of 123216427138 is 831724612321.

It is a self number, because there is not a number n which added to its sum of digits gives 123216427138.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89807206 + ... + 89808577.

It is an arithmetic number, because the mean of its divisors is an integer number (13471183800).

Almost surely, 2^123216427138 is an apocalyptic number.

123216427138 is a deficient number, since it is larger than the sum of its proper divisors (92322513662).

123216427138 is an equidigital number, since it uses as much as digits as its factorization.

123216427138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179615806 (or 179615792 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The spelling of 123216427138 in words is "one hundred twenty-three billion, two hundred sixteen million, four hundred twenty-seven thousand, one hundred thirty-eight".