13247635421 has 2 divisors, whose sum is σ = 13247635422. Its totient is φ = 13247635420.

The previous prime is 13247635403. The next prime is 13247635447. The reversal of 13247635421 is 12453674231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10698799225 + 2548836196 = 103435^2 + 50486^2 .

It is a cyclic number.

It is not a de Polignac number, because 13247635421 - 2³⁰ = 12173893597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13247635021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6623817710 + 6623817711.

It is an arithmetic number, because the mean of its divisors is an integer number (6623817711).

Almost surely, 2^13247635421 is an apocalyptic number.

It is an amenable number.

13247635421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13247635421 is an equidigital number, since it uses as much as digits as its factorization.

13247635421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 38.

The spelling of 13247635421 in words is "thirteen billion, two hundred forty-seven million, six hundred thirty-five thousand, four hundred twenty-one".