123123212112 has 40 divisors (see below), whose sum is σ = 322425407104. Its totient is φ = 40478863104.

The previous prime is 123123212111. The next prime is 123123212123. The reversal of 123123212112 is 211212321321.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123123212111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17565448 + ... + 17572455.

Almost surely, 2^123123212112 is an apocalyptic number.

123123212112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123123212112 is an abundant number, since it is smaller than the sum of its proper divisors (199302194992).

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

123123212112 is a wasteful number, since it uses less digits than its factorization.

123123212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35137987 (or 35137981 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 123123212112 its reverse (211212321321), we get a palindrome (334335533433).

The spelling of 123123212112 in words is "one hundred twenty-three billion, one hundred twenty-three million, two hundred twelve thousand, one hundred twelve".