1321321302221 has 4 divisors (see below), whose sum is σ = 1321529030844. Its totient is φ = 1321113573600.

The previous prime is 1321321302209. The next prime is 1321321302241. The reversal of 1321321302221 is 1222031231231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 872440062025 + 448881240196 = 934045^2 + 669986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321321302221 - 2⁶ = 1321321302157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321321302241) 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, 103854770 + ... + 103867491.

It is an arithmetic number, because the mean of its divisors is an integer number (330382257711).

Almost surely, 2^{1321321302221} is an apocalyptic number.

It is an amenable number.

1321321302221 is a deficient number, since it is larger than the sum of its proper divisors (207728623).

1321321302221 is an equidigital number, since it uses as much as digits as its factorization.

1321321302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207728622.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1321321302221 its reverse (1222031231231), we get a palindrome (2543352533452).

The spelling of 1321321302221 in words is "one trillion, three hundred twenty-one billion, three hundred twenty-one million, three hundred two thousand, two hundred twenty-one".