31131203313321 has 32 divisors (see below), whose sum is σ = 48374600071680. Its totient is φ = 19763570101248.

The previous prime is 31131203313289. The next prime is 31131203313337. The reversal of 31131203313321 is 12331330213113.

31131203313321 is a `hidden beast` number, since 3 + 1 + 1 + 3 + 1 + 2 + 0 + 331 + 3 + 321 = 666.

It is not a de Polignac number, because 31131203313321 - 2⁵ = 31131203313289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31131203313341) 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 31 ways as a sum of consecutive naturals, for example, 331467576 + ... + 331561481.

It is an arithmetic number, because the mean of its divisors is an integer number (1511706252240).

Almost surely, 2^{31131203313321} is an apocalyptic number.

It is an amenable number.

31131203313321 is a deficient number, since it is larger than the sum of its proper divisors (17243396758359).

31131203313321 is a wasteful number, since it uses less digits than its factorization.

31131203313321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663029150 (or 663029144 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

Adding to 31131203313321 its reverse (12331330213113), we get a palindrome (43462533526434).

The spelling of 31131203313321 in words is "thirty-one trillion, one hundred thirty-one billion, two hundred three million, three hundred thirteen thousand, three hundred twenty-one".