12112121311031 has 4 divisors (see below), whose sum is σ = 13842424355472. Its totient is φ = 10381818266592.

The previous prime is 12112121310983. The next prime is 12112121311033. The reversal of 12112121311031 is 13011312121121.

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-12112121311031 is a prime.

It is a super-2 number, since 2×12112121311031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112121310994 and 12112121311012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112121311033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865151522210 + ... + 865151522223.

It is an arithmetic number, because the mean of its divisors is an integer number (3460606088868).

Almost surely, 2^{12112121311031} is an apocalyptic number.

12112121311031 is a deficient number, since it is larger than the sum of its proper divisors (1730303044441).

12112121311031 is an equidigital number, since it uses as much as digits as its factorization.

12112121311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730303044440.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 12112121311031 its reverse (13011312121121), we get a palindrome (25123433432152).

The spelling of 12112121311031 in words is "twelve trillion, one hundred twelve billion, one hundred twenty-one million, three hundred eleven thousand, thirty-one".