331221344 has 24 divisors (see below), whose sum is σ = 680445360. Its totient is φ = 158409856.

The previous prime is 331221337. The next prime is 331221347. The reversal of 331221344 is 443122133.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331221347) 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 3 ways as a sum of consecutive naturals, for example, 224279 + ... + 225750.

It is an arithmetic number, because the mean of its divisors is an integer number (28351890).

Almost surely, 2^331221344 is an apocalyptic number.

It is an amenable number.

331221344 is an abundant number, since it is smaller than the sum of its proper divisors (349224016).

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

331221344 is a wasteful number, since it uses less digits than its factorization.

331221344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450062 (or 450054 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 331221344 is about 18199.4874653107. The cubic root of 331221344 is about 691.8937990652.

Adding to 331221344 its reverse (443122133), we get a palindrome (774343477).

The spelling of 331221344 in words is "three hundred thirty-one million, two hundred twenty-one thousand, three hundred forty-four".