203111310423 has 16 divisors (see below), whose sum is σ = 310075060736. Its totient is φ = 115849064160.

The previous prime is 203111310419. The next prime is 203111310503. The reversal of 203111310423 is 324013111302.

It is not a de Polignac number, because 203111310423 - 2² = 203111310419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 203111310423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203111310403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8927611 + ... + 8950332.

It is an arithmetic number, because the mean of its divisors is an integer number (19379691296).

Almost surely, 2^203111310423 is an apocalyptic number.

203111310423 is a deficient number, since it is larger than the sum of its proper divisors (106963750313).

203111310423 is a wasteful number, since it uses less digits than its factorization.

203111310423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17878494.

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

Adding to 203111310423 its reverse (324013111302), we get a palindrome (527124421725).

The spelling of 203111310423 in words is "two hundred three billion, one hundred eleven million, three hundred ten thousand, four hundred twenty-three".