31330302221 has 8 divisors (see below), whose sum is σ = 32416093080. Its totient is φ = 30244873792.

The previous prime is 31330302193. The next prime is 31330302239. The reversal of 31330302221 is 12220303313.

It can be written as a sum of positive squares in 4 ways, for example, as 4961089225 + 26369212996 = 70435^2 + 162386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31330302221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31330302193 and 31330302202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330302281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91511 + ... + 266523.

It is an arithmetic number, because the mean of its divisors is an integer number (4052011635).

Almost surely, 2^31330302221 is an apocalyptic number.

It is an amenable number.

31330302221 is a deficient number, since it is larger than the sum of its proper divisors (1085790859).

31330302221 is a wasteful number, since it uses less digits than its factorization.

31330302221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181215.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31330302221 its reverse (12220303313), we get a palindrome (43550605534).

The spelling of 31330302221 in words is "thirty-one billion, three hundred thirty million, three hundred two thousand, two hundred twenty-one".