312212320221 has 8 divisors (see below), whose sum is σ = 416830117824. Its totient is φ = 207868034720.

The previous prime is 312212320193. The next prime is 312212320241. The reversal of 312212320221 is 122023212213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 312212320221 - 2⁷ = 312212320093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312212320241) 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 7 ways as a sum of consecutive naturals, for example, 68375361 + ... + 68379926.

It is an arithmetic number, because the mean of its divisors is an integer number (52103764728).

Almost surely, 2^312212320221 is an apocalyptic number.

It is an amenable number.

312212320221 is a deficient number, since it is larger than the sum of its proper divisors (104617797603).

312212320221 is a wasteful number, since it uses less digits than its factorization.

312212320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136756051.

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

Adding to 312212320221 its reverse (122023212213), we get a palindrome (434235532434).

The spelling of 312212320221 in words is "three hundred twelve billion, two hundred twelve million, three hundred twenty thousand, two hundred twenty-one".