13321323021221 has 4 divisors (see below), whose sum is σ = 13780678987500. Its totient is φ = 12861967054944.

The previous prime is 13321323021217. The next prime is 13321323021233. The reversal of 13321323021221 is 12212032312331.

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 9908399313121 + 3412923708100 = 3147761^2 + 1847410^2 .

It is a cyclic number.

It is not a de Polignac number, because 13321323021221 - 2² = 13321323021217 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 (13321323020221) 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, 229677983096 + ... + 229677983153.

It is an arithmetic number, because the mean of its divisors is an integer number (3445169746875).

Almost surely, 2^{13321323021221} is an apocalyptic number.

It is an amenable number.

13321323021221 is a deficient number, since it is larger than the sum of its proper divisors (459355966279).

13321323021221 is an equidigital number, since it uses as much as digits as its factorization.

13321323021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459355966278.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 13321323021221 its reverse (12212032312331), we get a palindrome (25533355333552).

The spelling of 13321323021221 in words is "thirteen trillion, three hundred twenty-one billion, three hundred twenty-three million, twenty-one thousand, two hundred twenty-one".