123231342021 has 4 divisors (see below), whose sum is σ = 164308456032. Its totient is φ = 82154228012.

The previous prime is 123231342019. The next prime is 123231342043. The reversal of 123231342021 is 120243132321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123231342021 - 2¹ = 123231342019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123231341982 and 123231342000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123231342001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20538557001 + ... + 20538557006.

It is an arithmetic number, because the mean of its divisors is an integer number (41077114008).

Almost surely, 2^123231342021 is an apocalyptic number.

It is an amenable number.

123231342021 is a deficient number, since it is larger than the sum of its proper divisors (41077114011).

123231342021 is an equidigital number, since it uses as much as digits as its factorization.

123231342021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41077114010.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 123231342021 its reverse (120243132321), we get a palindrome (243474474342).

The spelling of 123231342021 in words is "one hundred twenty-three billion, two hundred thirty-one million, three hundred forty-two thousand, twenty-one".