31021330112221 has 4 divisors (see below), whose sum is σ = 31021422187932. Its totient is φ = 31021238036512.

The previous prime is 31021330112189. The next prime is 31021330112251. The reversal of 31021330112221 is 12221103312013.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6058066606596 + 24963263505625 = 2461314^2 + 4996325^2 .

It is a cyclic number.

It is not a de Polignac number, because 31021330112221 - 2⁵ = 31021330112189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31021330112192 and 31021330112201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021330112251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45530626 + ... + 46206931.

It is an arithmetic number, because the mean of its divisors is an integer number (7755355546983).

Almost surely, 2^{31021330112221} is an apocalyptic number.

It is an amenable number.

31021330112221 is a deficient number, since it is larger than the sum of its proper divisors (92075711).

31021330112221 is an equidigital number, since it uses as much as digits as its factorization.

31021330112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92075710.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31021330112221 its reverse (12221103312013), we get a palindrome (43242433424234).

The spelling of 31021330112221 in words is "thirty-one trillion, twenty-one billion, three hundred thirty million, one hundred twelve thousand, two hundred twenty-one".