312032220233221 has 4 divisors (see below), whose sum is σ = 312608989587244. Its totient is φ = 311455450879200.

The previous prime is 312032220233203. The next prime is 312032220233233. The reversal of 312032220233221 is 122332022230213.

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 152514966593025 + 159517253640196 = 12349695^2 + 12630014^2 .

It is a cyclic number.

It is not a de Polignac number, because 312032220233221 - 2⁵ = 312032220233189 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312032220233221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312032220233281) 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, 288384676200 + ... + 288384677281.

It is an arithmetic number, because the mean of its divisors is an integer number (78152247396811).

Almost surely, 2^{312032220233221} is an apocalyptic number.

It is an amenable number.

312032220233221 is a deficient number, since it is larger than the sum of its proper divisors (576769354023).

312032220233221 is an equidigital number, since it uses as much as digits as its factorization.

312032220233221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576769354022.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 312032220233221 its reverse (122332022230213), we get a palindrome (434364242463434).

The spelling of 312032220233221 in words is "three hundred twelve trillion, thirty-two billion, two hundred twenty million, two hundred thirty-three thousand, two hundred twenty-one".