312012422221 has 4 divisors (see below), whose sum is σ = 312814511100. Its totient is φ = 311210333344.

The previous prime is 312012422167. The next prime is 312012422231. The reversal of 312012422221 is 122224210213.

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 219130716996 + 92881705225 = 468114^2 + 304765^2 .

It is a cyclic number.

It is not a de Polignac number, because 312012422221 - 2⁹ = 312012421709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312012422192 and 312012422201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312012422231) 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, 401043856 + ... + 401044633.

It is an arithmetic number, because the mean of its divisors is an integer number (78203627775).

Almost surely, 2^312012422221 is an apocalyptic number.

It is an amenable number.

312012422221 is a deficient number, since it is larger than the sum of its proper divisors (802088879).

312012422221 is an equidigital number, since it uses as much as digits as its factorization.

312012422221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802088878.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 312012422221 its reverse (122224210213), we get a palindrome (434236632434).

The spelling of 312012422221 in words is "three hundred twelve billion, twelve million, four hundred twenty-two thousand, two hundred twenty-one".