31130113221 has 12 divisors (see below), whose sum is σ = 45378250060. Its totient is φ = 20563009920.

The previous prime is 31130113187. The next prime is 31130113237. The reversal of 31130113221 is 12231103113.

31130113221 is a `hidden beast` number, since 311 + 30 + 1 + 1 + 322 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27560648196 + 3569465025 = 166014^2 + 59745^2 .

It is not a de Polignac number, because 31130113221 - 2⁷ = 31130113093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31130113194 and 31130113203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130113321) 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, 15865540 + ... + 15867501.

Almost surely, 2^31130113221 is an apocalyptic number.

It is an amenable number.

31130113221 is a deficient number, since it is larger than the sum of its proper divisors (14248136839).

31130113221 is a wasteful number, since it uses less digits than its factorization.

31130113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31733156 (or 31733153 counting only the distinct ones).

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

Adding to 31130113221 its reverse (12231103113), we get a palindrome (43361216334).

The spelling of 31130113221 in words is "thirty-one billion, one hundred thirty million, one hundred thirteen thousand, two hundred twenty-one".