123431312321 has 16 divisors (see below), whose sum is σ = 134448811200. Its totient is φ = 112868376768.

The previous prime is 123431312297. The next prime is 123431312339. The reversal of 123431312321 is 123213134321.

It is a happy number.

It is not a de Polignac number, because 123431312321 - 2³⁰ = 122357570497 is a prime.

It is a super-2 number, since 2×123431312321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123431311321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1878011 + ... + 1942623.

It is an arithmetic number, because the mean of its divisors is an integer number (8403050700).

Almost surely, 2^123431312321 is an apocalyptic number.

It is an amenable number.

123431312321 is a deficient number, since it is larger than the sum of its proper divisors (11017498879).

123431312321 is a wasteful number, since it uses less digits than its factorization.

123431312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68128.

The product of its digits is 2592, while the sum is 26.

Adding to 123431312321 its reverse (123213134321), we get a palindrome (246644446642).

The spelling of 123431312321 in words is "one hundred twenty-three billion, four hundred thirty-one million, three hundred twelve thousand, three hundred twenty-one".