312042440221 has 4 divisors (see below), whose sum is σ = 317331295200. Its totient is φ = 306753585244.

The previous prime is 312042440219. The next prime is 312042440233. The reversal of 312042440221 is 122044240213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122044240213 = 7 ⋅17434891459.

It is a cyclic number.

It is not a de Polignac number, because 312042440221 - 2¹ = 312042440219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312042440261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2644427401 + ... + 2644427518.

It is an arithmetic number, because the mean of its divisors is an integer number (79332823800).

Almost surely, 2^312042440221 is an apocalyptic number.

It is an amenable number.

312042440221 is a deficient number, since it is larger than the sum of its proper divisors (5288854979).

312042440221 is an equidigital number, since it uses as much as digits as its factorization.

312042440221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5288854978.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 312042440221 its reverse (122044240213), we get a palindrome (434086680434).

The spelling of 312042440221 in words is "three hundred twelve billion, forty-two million, four hundred forty thousand, two hundred twenty-one".