312213222 has 12 divisors (see below), whose sum is σ = 676462020. Its totient is φ = 104071068.

The previous prime is 312213203. The next prime is 312213227. The reversal of 312213222 is 222312213.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 17345179 = 312213222 / (3 + 1 + 2 + 2 + 1 + 3 + 2 + 2 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 312213195 and 312213204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312213227) 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 5 ways as a sum of consecutive naturals, for example, 8672572 + ... + 8672607.

It is an arithmetic number, because the mean of its divisors is an integer number (56371835).

Almost surely, 2^312213222 is an apocalyptic number.

312213222 is an abundant number, since it is smaller than the sum of its proper divisors (364248798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312213222 is a wasteful number, since it uses less digits than its factorization.

312213222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17345187 (or 17345184 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 312213222 is about 17669.5563611541. The cubic root of 312213222 is about 678.3967578828.

Adding to 312213222 its reverse (222312213), we get a palindrome (534525435).

It can be divided in two parts, 31221 and 3222, that added together give a palindrome (34443).

The spelling of 312213222 in words is "three hundred twelve million, two hundred thirteen thousand, two hundred twenty-two".