123213044310421 has 6 divisors (see below), whose sum is σ = 133420042064130. Its totient is φ = 113735117824848.

The previous prime is 123213044310407. The next prime is 123213044310437. The reversal of 123213044310421 is 124013440312321.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6757327464196 + 116455716846225 = 2599486^2 + 10791465^2 .

It is not a de Polignac number, because 123213044310421 - 2²⁷ = 123212910092693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123213044310481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364535633886 + ... + 364535634223.

It is an arithmetic number, because the mean of its divisors is an integer number (22236673677355).

Almost surely, 2^{123213044310421} is an apocalyptic number.

It is an amenable number.

123213044310421 is a deficient number, since it is larger than the sum of its proper divisors (10206997753709).

123213044310421 is an equidigital number, since it uses as much as digits as its factorization.

123213044310421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729071268135 (or 729071268122 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 123213044310421 its reverse (124013440312321), we get a palindrome (247226484622742).

The spelling of 123213044310421 in words is "one hundred twenty-three trillion, two hundred thirteen billion, forty-four million, three hundred ten thousand, four hundred twenty-one".