123423121312 has 48 divisors (see below), whose sum is σ = 249835065984. Its totient is φ = 59984064000.

The previous prime is 123423121309. The next prime is 123423121343. The reversal of 123423121312 is 213121324321.

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, 181987 + ... + 529117.

It is an arithmetic number, because the mean of its divisors is an integer number (5204897208).

Almost surely, 2^123423121312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123423121312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124917532992).

123423121312 is an abundant number, since it is smaller than the sum of its proper divisors (126411944672).

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

123423121312 is a wasteful number, since it uses less digits than its factorization.

123423121312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347453 (or 347445 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

Adding to 123423121312 its reverse (213121324321), we get a palindrome (336544445633).

The spelling of 123423121312 in words is "one hundred twenty-three billion, four hundred twenty-three million, one hundred twenty-one thousand, three hundred twelve".