13211443997 has 2 divisors, whose sum is σ = 13211443998. Its totient is φ = 13211443996.

The previous prime is 13211443963. The next prime is 13211444087. The reversal of 13211443997 is 79934411231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9076182361 + 4135261636 = 95269^2 + 64306^2 .

It is an emirp because it is prime and its reverse (79934411231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13211443997 - 2⁸ = 13211443741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13211473997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6605721998 + 6605721999.

It is an arithmetic number, because the mean of its divisors is an integer number (6605721999).

Almost surely, 2^13211443997 is an apocalyptic number.

It is an amenable number.

13211443997 is a deficient number, since it is larger than the sum of its proper divisors (1).

13211443997 is an equidigital number, since it uses as much as digits as its factorization.

13211443997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The spelling of 13211443997 in words is "thirteen billion, two hundred eleven million, four hundred forty-three thousand, nine hundred ninety-seven".