31310113221 has 16 divisors (see below), whose sum is σ = 46844617920. Its totient is φ = 20666739600.

The previous prime is 31310113217. The next prime is 31310113223. The reversal of 31310113221 is 12231101313.

31310113221 is a `hidden beast` number, since 31 + 310 + 1 + 1 + 322 + 1 = 666.

It is not a de Polignac number, because 31310113221 - 2² = 31310113217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31310113194 and 31310113203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310113223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5738035 + ... + 5743488.

It is an arithmetic number, because the mean of its divisors is an integer number (2927788620).

Almost surely, 2^31310113221 is an apocalyptic number.

It is an amenable number.

31310113221 is a deficient number, since it is larger than the sum of its proper divisors (15534504699).

31310113221 is a wasteful number, since it uses less digits than its factorization.

31310113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11481633 (or 11481627 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31310113221 its reverse (12231101313), we get a palindrome (43541214534).

The spelling of 31310113221 in words is "thirty-one billion, three hundred ten million, one hundred thirteen thousand, two hundred twenty-one".