13320131231221 has 4 divisors (see below), whose sum is σ = 13415959513600. Its totient is φ = 13224302948844.

The previous prime is 13320131231219. The next prime is 13320131231311. The reversal of 13320131231221 is 12213213102331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13320131231221 - 2¹ = 13320131231219 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 (13320131231321) 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, 47914140981 + ... + 47914141258.

It is an arithmetic number, because the mean of its divisors is an integer number (3353989878400).

Almost surely, 2^{13320131231221} is an apocalyptic number.

It is an amenable number.

13320131231221 is a deficient number, since it is larger than the sum of its proper divisors (95828282379).

13320131231221 is an equidigital number, since it uses as much as digits as its factorization.

13320131231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95828282378.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 13320131231221 its reverse (12213213102331), we get a palindrome (25533344333552).

The spelling of 13320131231221 in words is "thirteen trillion, three hundred twenty billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty-one".