13131444421 has 2 divisors, whose sum is σ = 13131444422. Its totient is φ = 13131444420.

The previous prime is 13131444373. The next prime is 13131444427. The reversal of 13131444421 is 12444413131.

13131444421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11574747396 + 1556697025 = 107586^2 + 39455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13131444421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13131444421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13131444427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6565722210 + 6565722211.

It is an arithmetic number, because the mean of its divisors is an integer number (6565722211).

Almost surely, 2^13131444421 is an apocalyptic number.

It is an amenable number.

13131444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13131444421 is an equidigital number, since it uses as much as digits as its factorization.

13131444421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 28.

Adding to 13131444421 its reverse (12444413131), we get a palindrome (25575857552).

The spelling of 13131444421 in words is "thirteen billion, one hundred thirty-one million, four hundred forty-four thousand, four hundred twenty-one".