203202442123 has 4 divisors (see below), whose sum is σ = 205485615720. Its totient is φ = 200919268528.

The previous prime is 203202442111. The next prime is 203202442139. The reversal of 203202442123 is 321244202302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203202442123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203202446123) 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, 1141586665 + ... + 1141586842.

It is an arithmetic number, because the mean of its divisors is an integer number (51371403930).

Almost surely, 2^203202442123 is an apocalyptic number.

203202442123 is a deficient number, since it is larger than the sum of its proper divisors (2283173597).

203202442123 is an equidigital number, since it uses as much as digits as its factorization.

203202442123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283173596.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 203202442123 its reverse (321244202302), we get a palindrome (524446644425).

The spelling of 203202442123 in words is "two hundred three billion, two hundred two million, four hundred forty-two thousand, one hundred twenty-three".