13504766621 has 2 divisors, whose sum is σ = 13504766622. Its totient is φ = 13504766620.

The previous prime is 13504766581. The next prime is 13504766633. The reversal of 13504766621 is 12666740531.

13504766621 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., 7256654596 + 6248112025 = 85186^2 + 79045^2 .

It is a cyclic number.

It is not a de Polignac number, because 13504766621 - 2¹⁸ = 13504504477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13504768621) 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, 6752383310 + 6752383311.

It is an arithmetic number, because the mean of its divisors is an integer number (6752383311).

Almost surely, 2^13504766621 is an apocalyptic number.

It is an amenable number.

13504766621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13504766621 is an equidigital number, since it uses as much as digits as its factorization.

13504766621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 13504766621 in words is "thirteen billion, five hundred four million, seven hundred sixty-six thousand, six hundred twenty-one".