123243431320321 has 16 divisors (see below), whose sum is σ = 133469887440960. Its totient is φ = 113123619028800.

The previous prime is 123243431320319. The next prime is 123243431320391. The reversal of 123243431320321 is 123023134342321.

It is a cyclic number.

It is not a de Polignac number, because 123243431320321 - 2¹ = 123243431320319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123243431320391) 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, 65916471 + ... + 67760371.

It is an arithmetic number, because the mean of its divisors is an integer number (8341867965060).

Almost surely, 2^{123243431320321} is an apocalyptic number.

It is an amenable number.

123243431320321 is a deficient number, since it is larger than the sum of its proper divisors (10226456120639).

123243431320321 is a wasteful number, since it uses less digits than its factorization.

123243431320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872816.

The product of its (nonzero) digits is 62208, while the sum is 34.

Adding to 123243431320321 its reverse (123023134342321), we get a palindrome (246266565662642).

The spelling of 123243431320321 in words is "one hundred twenty-three trillion, two hundred forty-three billion, four hundred thirty-one million, three hundred twenty thousand, three hundred twenty-one".