13673123521 has 2 divisors, whose sum is σ = 13673123522. Its totient is φ = 13673123520.

The previous prime is 13673123491. The next prime is 13673123591. The reversal of 13673123521 is 12532137631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10187874225 + 3485249296 = 100935^2 + 59036^2 .

It is a cyclic number.

It is not a de Polignac number, because 13673123521 - 2¹³ = 13673115329 is a prime.

It is not a weakly prime, because it can be changed into another prime (13673123591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6836561760 + 6836561761.

It is an arithmetic number, because the mean of its divisors is an integer number (6836561761).

Almost surely, 2^13673123521 is an apocalyptic number.

It is an amenable number.

13673123521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13673123521 is an equidigital number, since it uses as much as digits as its factorization.

13673123521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 34.

The spelling of 13673123521 in words is "thirteen billion, six hundred seventy-three million, one hundred twenty-three thousand, five hundred twenty-one".