312044420221 has 4 divisors (see below), whose sum is σ = 313419065472. Its totient is φ = 310669774972.

The previous prime is 312044420161. The next prime is 312044420299. The reversal of 312044420221 is 122024440213.

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: 122024440213 = 13 ⋅9386495401.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312044420221 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 (312044420021) 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 3 ways as a sum of consecutive naturals, for example, 687322285 + ... + 687322738.

It is an arithmetic number, because the mean of its divisors is an integer number (78354766368).

Almost surely, 2^312044420221 is an apocalyptic number.

It is an amenable number.

312044420221 is a deficient number, since it is larger than the sum of its proper divisors (1374645251).

312044420221 is a wasteful number, since it uses less digits than its factorization.

312044420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374645250.

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

Adding to 312044420221 its reverse (122024440213), we get a palindrome (434068860434).

The spelling of 312044420221 in words is "three hundred twelve billion, forty-four million, four hundred twenty thousand, two hundred twenty-one".