31332221321 has 4 divisors (see below), whose sum is σ = 31370951700. Its totient is φ = 31293490944.

The previous prime is 31332221273. The next prime is 31332221357. The reversal of 31332221321 is 12312223313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12312223313 = 13 ⋅947094101.

It can be written as a sum of positive squares in 2 ways, for example, as 29604987721 + 1727233600 = 172061^2 + 41560^2 .

It is a cyclic number.

It is not a de Polignac number, because 31332221321 - 2³⁰ = 30258479497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31332220321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19363976 + ... + 19365593.

It is an arithmetic number, because the mean of its divisors is an integer number (7842737925).

Almost surely, 2^31332221321 is an apocalyptic number.

It is an amenable number.

31332221321 is a deficient number, since it is larger than the sum of its proper divisors (38730379).

31332221321 is an equidigital number, since it uses as much as digits as its factorization.

31332221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38730378.

The product of its digits is 1296, while the sum is 23.

Adding to 31332221321 its reverse (12312223313), we get a palindrome (43644444634).

The spelling of 31332221321 in words is "thirty-one billion, three hundred thirty-two million, two hundred twenty-one thousand, three hundred twenty-one".