203123213123 has 4 divisors (see below), whose sum is σ = 203197920960. Its totient is φ = 203048505288.

The previous prime is 203123213101. The next prime is 203123213143. The reversal of 203123213123 is 321312321302.

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

It is a cyclic number.

It is not a de Polignac number, because 203123213123 - 2⁸ = 203123212867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203123213143) 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, 37349840 + ... + 37355277.

It is an arithmetic number, because the mean of its divisors is an integer number (50799480240).

Almost surely, 2^203123213123 is an apocalyptic number.

203123213123 is a deficient number, since it is larger than the sum of its proper divisors (74707837).

203123213123 is an equidigital number, since it uses as much as digits as its factorization.

203123213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74707836.

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

Adding to 203123213123 its reverse (321312321302), we get a palindrome (524435534425).

The spelling of 203123213123 in words is "two hundred three billion, one hundred twenty-three million, two hundred thirteen thousand, one hundred twenty-three".