203112323111 has 16 divisors (see below), whose sum is σ = 215039784960. Its totient is φ = 191309156640.

The previous prime is 203112323107. The next prime is 203112323159. The reversal of 203112323111 is 111323211302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 203112323111 - 2² = 203112323107 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 (203112323411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24505610 + ... + 24513896.

It is an arithmetic number, because the mean of its divisors is an integer number (13439986560).

Almost surely, 2^203112323111 is an apocalyptic number.

203112323111 is a deficient number, since it is larger than the sum of its proper divisors (11927461849).

203112323111 is a wasteful number, since it uses less digits than its factorization.

203112323111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15614.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 203112323111 its reverse (111323211302), we get a palindrome (314435534413).

The spelling of 203112323111 in words is "two hundred three billion, one hundred twelve million, three hundred twenty-three thousand, one hundred eleven".