321322121221 has 4 divisors (see below), whose sum is σ = 324270030700. Its totient is φ = 318374211744.

The previous prime is 321322121203. The next prime is 321322121231. The reversal of 321322121221 is 122121223123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122121223123 = 25643 ⋅4762361.

It can be written as a sum of positive squares in 2 ways, for example, as 86150468196 + 235171653025 = 293514^2 + 484945^2 .

It is a cyclic number.

It is not a de Polignac number, because 321322121221 - 2⁷ = 321322121093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321322121192 and 321322121201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321322121231) 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, 1473954576 + ... + 1473954793.

It is an arithmetic number, because the mean of its divisors is an integer number (81067507675).

Almost surely, 2^321322121221 is an apocalyptic number.

It is an amenable number.

321322121221 is a deficient number, since it is larger than the sum of its proper divisors (2947909479).

321322121221 is a wasteful number, since it uses less digits than its factorization.

321322121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947909478.

The product of its digits is 576, while the sum is 22.

Adding to 321322121221 its reverse (122121223123), we get a palindrome (443443344344).

The spelling of 321322121221 in words is "three hundred twenty-one billion, three hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".