123031203230021 has 4 divisors (see below), whose sum is σ = 126999951721344. Its totient is φ = 119062454738700.

The previous prime is 123031203229951. The next prime is 123031203230027. The reversal of 123031203230021 is 120032302130321.

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 a de Polignac number, because none of the positive numbers 2^k-123031203230021 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 (123031203230027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1984374245615 + ... + 1984374245676.

It is an arithmetic number, because the mean of its divisors is an integer number (31749987930336).

Almost surely, 2^{123031203230021} is an apocalyptic number.

It is an amenable number.

123031203230021 is a deficient number, since it is larger than the sum of its proper divisors (3968748491323).

123031203230021 is an equidigital number, since it uses as much as digits as its factorization.

123031203230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968748491322.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 123031203230021 its reverse (120032302130321), we get a palindrome (243063505360342).

The spelling of 123031203230021 in words is "one hundred twenty-three trillion, thirty-one billion, two hundred three million, two hundred thirty thousand, twenty-one".