203112312111 has 12 divisors (see below), whose sum is σ = 293389431192. Its totient is φ = 135405909456.

The previous prime is 203112312101. The next prime is 203112312121. The reversal of 203112312111 is 111213211302.

It is an interprime number because it is at equal distance from previous prime (203112312101) and next prime (203112312121).

It is not a de Polignac number, because 203112312111 - 2⁵ = 203112312079 is a prime.

It is a super-2 number, since 2×203112312111² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203112312101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 499165 + ... + 809561.

It is an arithmetic number, because the mean of its divisors is an integer number (24449119266).

Almost surely, 2^203112312111 is an apocalyptic number.

203112312111 is a deficient number, since it is larger than the sum of its proper divisors (90277119081).

203112312111 is a wasteful number, since it uses less digits than its factorization.

203112312111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383110 (or 383107 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 203112312111 its reverse (111213211302), we get a palindrome (314325523413).

The spelling of 203112312111 in words is "two hundred three billion, one hundred twelve million, three hundred twelve thousand, one hundred eleven".