13122320221 has 4 divisors (see below), whose sum is σ = 13124060572. Its totient is φ = 13120579872.

The previous prime is 13122320207. The next prime is 13122320261. The reversal of 13122320221 is 12202322131.

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 10883705625 + 2238614596 = 104325^2 + 47314^2 .

It is a cyclic number.

It is not a de Polignac number, because 13122320221 - 2³³ = 4532385629 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 (13122320261) 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, 858816 + ... + 873961.

It is an arithmetic number, because the mean of its divisors is an integer number (3281015143).

Almost surely, 2^13122320221 is an apocalyptic number.

It is an amenable number.

13122320221 is a deficient number, since it is larger than the sum of its proper divisors (1740351).

13122320221 is an equidigital number, since it uses as much as digits as its factorization.

13122320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740350.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 13122320221 its reverse (12202322131), we get a palindrome (25324642352).

The spelling of 13122320221 in words is "thirteen billion, one hundred twenty-two million, three hundred twenty thousand, two hundred twenty-one".