13213321021 has 2 divisors, whose sum is σ = 13213321022. Its totient is φ = 13213321020.

The previous prime is 13213321013. The next prime is 13213321057. The reversal of 13213321021 is 12012331231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8461976121 + 4751344900 = 91989^2 + 68930^2 .

It is a cyclic number.

It is not a de Polignac number, because 13213321021 - 2³ = 13213321013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13213321021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13213321001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606660510 + 6606660511.

It is an arithmetic number, because the mean of its divisors is an integer number (6606660511).

Almost surely, 2^13213321021 is an apocalyptic number.

It is an amenable number.

13213321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13213321021 is an equidigital number, since it uses as much as digits as its factorization.

13213321021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13213321021 its reverse (12012331231), we get a palindrome (25225652252).

The spelling of 13213321021 in words is "thirteen billion, two hundred thirteen million, three hundred twenty-one thousand, twenty-one".