321221330321 has 4 divisors (see below), whose sum is σ = 321222537444. Its totient is φ = 321220123200.

The previous prime is 321221330317. The next prime is 321221330351. The reversal of 321221330321 is 123033122123.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 195417043600 + 125804286721 = 442060^2 + 354689^2 .

It is a cyclic number.

It is not a de Polignac number, because 321221330321 - 2² = 321221330317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321221330351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9500 + ... + 801581.

It is an arithmetic number, because the mean of its divisors is an integer number (80305634361).

Almost surely, 2^321221330321 is an apocalyptic number.

It is an amenable number.

321221330321 is a deficient number, since it is larger than the sum of its proper divisors (1207123).

321221330321 is an equidigital number, since it uses as much as digits as its factorization.

321221330321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207122.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 321221330321 its reverse (123033122123), we get a palindrome (444254452444).

The spelling of 321221330321 in words is "three hundred twenty-one billion, two hundred twenty-one million, three hundred thirty thousand, three hundred twenty-one".