321553303212 has 24 divisors (see below), whose sum is σ = 750336685056. Its totient is φ = 107177913808.

The previous prime is 321553303199. The next prime is 321553303243. The reversal of 321553303212 is 212303355123.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 321553303212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 607488 + ... + 1006055.

It is an arithmetic number, because the mean of its divisors is an integer number (31264028544).

Almost surely, 2^321553303212 is an apocalyptic number.

It is an amenable number.

321553303212 is an abundant number, since it is smaller than the sum of its proper divisors (428783381844).

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

321553303212 is a wasteful number, since it uses less digits than its factorization.

321553303212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630157 (or 1630155 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 321553303212 its reverse (212303355123), we get a palindrome (533856658335).

The spelling of 321553303212 in words is "three hundred twenty-one billion, five hundred fifty-three million, three hundred three thousand, two hundred twelve".