31112321212031 has 4 divisors (see below), whose sum is σ = 31114512697752. Its totient is φ = 31110129726312.

The previous prime is 31112321212013. The next prime is 31112321212043. The reversal of 31112321212031 is 13021212321113.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31112321212031 - 2⁶ = 31112321211967 is a prime.

It is a super-2 number, since 2×31112321212031² (a number of 28 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 = 31112321211988 and 31112321212006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31112321212081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095721565 + ... + 1095749958.

It is an arithmetic number, because the mean of its divisors is an integer number (7778628174438).

Almost surely, 2^{31112321212031} is an apocalyptic number.

31112321212031 is a deficient number, since it is larger than the sum of its proper divisors (2191485721).

31112321212031 is a wasteful number, since it uses less digits than its factorization.

31112321212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191485720.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31112321212031 its reverse (13021212321113), we get a palindrome (44133533533144).

The spelling of 31112321212031 in words is "thirty-one trillion, one hundred twelve billion, three hundred twenty-one million, two hundred twelve thousand, thirty-one".