321221023321 has 24 divisors (see below), whose sum is σ = 374007390120. Its totient is φ = 274723553280.

The previous prime is 321221023301. The next prime is 321221023339. The reversal of 321221023321 is 123320122123.

It can be written as a sum of positive squares in 4 ways, for example, as 229214967696 + 92006055625 = 478764^2 + 303325^2 .

It is not a de Polignac number, because 321221023321 - 2⁵ = 321221023289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321221023292 and 321221023301.

It is not an unprimeable number, because it can be changed into a prime (321221023301) 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 23 ways as a sum of consecutive naturals, for example, 4939465 + ... + 5004073.

It is an arithmetic number, because the mean of its divisors is an integer number (15583641255).

Almost surely, 2^321221023321 is an apocalyptic number.

It is an amenable number.

321221023321 is a deficient number, since it is larger than the sum of its proper divisors (52786366799).

321221023321 is a wasteful number, since it uses less digits than its factorization.

321221023321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67065 (or 67054 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 321221023321 its reverse (123320122123), we get a palindrome (444541145444).

The spelling of 321221023321 in words is "three hundred twenty-one billion, two hundred twenty-one million, twenty-three thousand, three hundred twenty-one".