312221322 has 24 divisors (see below), whose sum is σ = 773119776. Its totient is φ = 89206056.

The previous prime is 312221321. The next prime is 312221353. The reversal of 312221322 is 223122213.

It is a super-2 number, since 2×312221322² = 194964307822855368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 = 312221295 and 312221304.

It is not an unprimeable number, because it can be changed into a prime (312221321) 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 11 ways as a sum of consecutive naturals, for example, 1238848 + ... + 1239099.

It is an arithmetic number, because the mean of its divisors is an integer number (32213324).

Almost surely, 2^312221322 is an apocalyptic number.

312221322 is an abundant number, since it is smaller than the sum of its proper divisors (460898454).

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

312221322 is a wasteful number, since it uses less digits than its factorization.

312221322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2477962 (or 2477959 counting only the distinct ones).

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

The square root of 312221322 is about 17669.7855674595. The cubic root of 312221322 is about 678.4026245639.

Adding to 312221322 its reverse (223122213), we get a palindrome (535343535).

It can be divided in two parts, 3122213 and 22, that multiplied together give a palindrome (68688686).

The spelling of 312221322 in words is "three hundred twelve million, two hundred twenty-one thousand, three hundred twenty-two".