123211203123 has 4 divisors (see below), whose sum is σ = 164281604168. Its totient is φ = 82140802080.

The previous prime is 123211203053. The next prime is 123211203197. The reversal of 123211203123 is 321302112321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123211203123 - 2²⁰ = 123210154547 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 123211203123.

It is not an unprimeable number, because it can be changed into a prime (123211203023) 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, 20535200518 + ... + 20535200523.

It is an arithmetic number, because the mean of its divisors is an integer number (41070401042).

Almost surely, 2^123211203123 is an apocalyptic number.

123211203123 is a deficient number, since it is larger than the sum of its proper divisors (41070401045).

123211203123 is an equidigital number, since it uses as much as digits as its factorization.

123211203123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41070401044.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 123211203123 its reverse (321302112321), we get a palindrome (444513315444).

The spelling of 123211203123 in words is "one hundred twenty-three billion, two hundred eleven million, two hundred three thousand, one hundred twenty-three".