13211533421 has 2 divisors, whose sum is σ = 13211533422. Its totient is φ = 13211533420.

The previous prime is 13211533403. The next prime is 13211533429. The reversal of 13211533421 is 12433511231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7728871396 + 5482662025 = 87914^2 + 74045^2 .

It is an emirp because it is prime and its reverse (12433511231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13211533421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13211533429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6605766710 + 6605766711.

It is an arithmetic number, because the mean of its divisors is an integer number (6605766711).

Almost surely, 2^13211533421 is an apocalyptic number.

It is an amenable number.

13211533421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13211533421 is an equidigital number, since it uses as much as digits as its factorization.

13211533421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 26.

The spelling of 13211533421 in words is "thirteen billion, two hundred eleven million, five hundred thirty-three thousand, four hundred twenty-one".