13321210311221 has 4 divisors (see below), whose sum is σ = 13341363428844. Its totient is φ = 13301057193600.

The previous prime is 13321210311217. The next prime is 13321210311223. The reversal of 13321210311221 is 12211301212331.

It is a happy number.

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 11300152864900 + 2021057446321 = 3361570^2 + 1421639^2 .

It is a cyclic number.

It is not a de Polignac number, because 13321210311221 - 2² = 13321210311217 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 (13321210311223) 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, 10076557820 + ... + 10076559141.

It is an arithmetic number, because the mean of its divisors is an integer number (3335340857211).

Almost surely, 2^{13321210311221} is an apocalyptic number.

It is an amenable number.

13321210311221 is a deficient number, since it is larger than the sum of its proper divisors (20153117623).

13321210311221 is an equidigital number, since it uses as much as digits as its factorization.

13321210311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20153117622.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 13321210311221 its reverse (12211301212331), we get a palindrome (25532511523552).

The spelling of 13321210311221 in words is "thirteen trillion, three hundred twenty-one billion, two hundred ten million, three hundred eleven thousand, two hundred twenty-one".