13013321021 has 2 divisors, whose sum is σ = 13013321022. Its totient is φ = 13013321020.

The previous prime is 13013321011. The next prime is 13013321033. The reversal of 13013321021 is 12012331031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12452104921 + 561216100 = 111589^2 + 23690^2 .

It is a cyclic number.

It is not a de Polignac number, because 13013321021 - 2²² = 13009126717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13013321011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6506660510 + 6506660511.

It is an arithmetic number, because the mean of its divisors is an integer number (6506660511).

Almost surely, 2^13013321021 is an apocalyptic number.

It is an amenable number.

13013321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13013321021 is an equidigital number, since it uses as much as digits as its factorization.

13013321021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 13013321021 its reverse (12012331031), we get a palindrome (25025652052).

The spelling of 13013321021 in words is "thirteen billion, thirteen million, three hundred twenty-one thousand, twenty-one".