312321210212221 has 24 divisors (see below), whose sum is σ = 373547042305920. Its totient is φ = 260210787076800.

The previous prime is 312321210212147. The next prime is 312321210212243. The reversal of 312321210212221 is 122212012123213.

It is not a de Polignac number, because 312321210212221 - 2¹¹ = 312321210210173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312321210512221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 286284031 + ... + 287372908.

It is an arithmetic number, because the mean of its divisors is an integer number (15564460096080).

Almost surely, 2^{312321210212221} is an apocalyptic number.

It is an amenable number.

312321210212221 is a deficient number, since it is larger than the sum of its proper divisors (61225832093699).

312321210212221 is a wasteful number, since it uses less digits than its factorization.

312321210212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573657265 (or 573657258 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 312321210212221 its reverse (122212012123213), we get a palindrome (434533222335434).

The spelling of 312321210212221 in words is "three hundred twelve trillion, three hundred twenty-one billion, two hundred ten million, two hundred twelve thousand, two hundred twenty-one".