13230431021 has 2 divisors, whose sum is σ = 13230431022. Its totient is φ = 13230431020.

The previous prime is 13230431003. The next prime is 13230431047. The reversal of 13230431021 is 12013403231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8975478121 + 4254952900 = 94739^2 + 65230^2 .

It is an emirp because it is prime and its reverse (12013403231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13230431021 - 2²² = 13226236717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13230430984 and 13230431002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13230431821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615215510 + 6615215511.

It is an arithmetic number, because the mean of its divisors is an integer number (6615215511).

Almost surely, 2^13230431021 is an apocalyptic number.

It is an amenable number.

13230431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13230431021 is an equidigital number, since it uses as much as digits as its factorization.

13230431021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 13230431021 its reverse (12013403231), we get a palindrome (25243834252).

The spelling of 13230431021 in words is "thirteen billion, two hundred thirty million, four hundred thirty-one thousand, twenty-one".