313221222 has 64 divisors (see below), whose sum is σ = 744145920. Its totient is φ = 97416000.

The previous prime is 313221203. The next prime is 313221253. The reversal of 313221222 is 222122313.

It is a super-2 number, since 2×313221222² = 196215067822346568, 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 = 313221195 and 313221204.

It is a congruent number.

It is an unprimeable number.

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, 47847 + ... + 53997.

It is an arithmetic number, because the mean of its divisors is an integer number (11627280).

Almost surely, 2^313221222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 313221222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372072960).

313221222 is an abundant number, since it is smaller than the sum of its proper divisors (430924698).

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

313221222 is a wasteful number, since it uses less digits than its factorization.

313221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226 (or 6220 counting only the distinct ones).

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

The square root of 313221222 is about 17698.0570119999. The cubic root of 313221222 is about 679.1260557665.

Adding to 313221222 its reverse (222122313), we get a palindrome (535343535).

The spelling of 313221222 in words is "three hundred thirteen million, two hundred twenty-one thousand, two hundred twenty-two".