123243433412421 has 32 divisors (see below), whose sum is σ = 188104442391808. Its totient is φ = 70310528547840.

The previous prime is 123243433412413. The next prime is 123243433412453. The reversal of 123243433412421 is 124214334342321.

It is not a de Polignac number, because 123243433412421 - 2³ = 123243433412413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123243433412421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123243433412821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51496731 + ... + 53836791.

It is an arithmetic number, because the mean of its divisors is an integer number (5878263824744).

Almost surely, 2^{123243433412421} is an apocalyptic number.

It is an amenable number.

123243433412421 is a deficient number, since it is larger than the sum of its proper divisors (64861008979387).

123243433412421 is a wasteful number, since it uses less digits than its factorization.

123243433412421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344141.

The product of its digits is 331776, while the sum is 39.

Adding to 123243433412421 its reverse (124214334342321), we get a palindrome (247457767754742).

The spelling of 123243433412421 in words is "one hundred twenty-three trillion, two hundred forty-three billion, four hundred thirty-three million, four hundred twelve thousand, four hundred twenty-one".