31312022221321 has 8 divisors (see below), whose sum is σ = 31392875709000. Its totient is φ = 31231170579840.

The previous prime is 31312022221289. The next prime is 31312022221367. The reversal of 31312022221321 is 12312222021313.

It can be written as a sum of positive squares in 4 ways, for example, as 1775460311296 + 29536561910025 = 1332464^2 + 5434755^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31312022221321 - 2⁵ = 31312022221289 is a prime.

It is a super-2 number, since 2×31312022221321² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312022221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37533981 + ... + 38359141.

It is an arithmetic number, because the mean of its divisors is an integer number (3924109463625).

Almost surely, 2^{31312022221321} is an apocalyptic number.

It is an amenable number.

31312022221321 is a deficient number, since it is larger than the sum of its proper divisors (80853487679).

31312022221321 is an equidigital number, since it uses as much as digits as its factorization.

31312022221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923099.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31312022221321 its reverse (12312222021313), we get a palindrome (43624244242634).

The spelling of 31312022221321 in words is "thirty-one trillion, three hundred twelve billion, twenty-two million, two hundred twenty-one thousand, three hundred twenty-one".