312022221 has 32 divisors (see below), whose sum is σ = 495091968. Its totient is φ = 171072000.

The previous prime is 312022189. The next prime is 312022231. The reversal of 312022221 is 122220213.

It is a happy number.

It is not a de Polignac number, because 312022221 - 2⁵ = 312022189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312022231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53971 + ... + 59471.

It is an arithmetic number, because the mean of its divisors is an integer number (15471624).

Almost surely, 2^312022221 is an apocalyptic number.

It is an amenable number.

312022221 is a deficient number, since it is larger than the sum of its proper divisors (183069747).

312022221 is a wasteful number, since it uses less digits than its factorization.

312022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5621.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 312022221 is about 17664.1507296558. The cubic root of 312022221 is about 678.2583899534.

Adding to 312022221 its reverse (122220213), we get a palindrome (434242434).

The spelling of 312022221 in words is "three hundred twelve million, twenty-two thousand, two hundred twenty-one".