321331214521 has 4 divisors (see below), whose sum is σ = 321389612032. Its totient is φ = 321272817012.

The previous prime is 321331214513. The next prime is 321331214531. The reversal of 321331214521 is 125412133123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 321331214521 - 2³ = 321331214513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321331214521.

It is not an unprimeable number, because it can be changed into a prime (321331214531) 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 3 ways as a sum of consecutive naturals, for example, 29190501 + ... + 29201506.

It is an arithmetic number, because the mean of its divisors is an integer number (80347403008).

Almost surely, 2^321331214521 is an apocalyptic number.

It is an amenable number.

321331214521 is a deficient number, since it is larger than the sum of its proper divisors (58397511).

321331214521 is an equidigital number, since it uses as much as digits as its factorization.

321331214521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58397510.

The product of its digits is 4320, while the sum is 28.

Adding to 321331214521 its reverse (125412133123), we get a palindrome (446743347644).

The spelling of 321331214521 in words is "three hundred twenty-one billion, three hundred thirty-one million, two hundred fourteen thousand, five hundred twenty-one".