312212023221 has 16 divisors (see below), whose sum is σ = 475759528064. Its totient is φ = 178403917824.

The previous prime is 312212023219. The next prime is 312212023237. The reversal of 312212023221 is 122320212213.

It is not a de Polignac number, because 312212023221 - 2¹ = 312212023219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312212023021) 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 15 ways as a sum of consecutive naturals, for example, 2170101 + ... + 2309493.

It is an arithmetic number, because the mean of its divisors is an integer number (29734970504).

Almost surely, 2^312212023221 is an apocalyptic number.

It is an amenable number.

312212023221 is a deficient number, since it is larger than the sum of its proper divisors (163547504843).

312212023221 is a wasteful number, since it uses less digits than its factorization.

312212023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246060.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 312212023221 its reverse (122320212213), we get a palindrome (434532235434).

The spelling of 312212023221 in words is "three hundred twelve billion, two hundred twelve million, twenty-three thousand, two hundred twenty-one".