13345129521 has 12 divisors (see below), whose sum is σ = 19387724148. Its totient is φ = 8845325664.

The previous prime is 13345129453. The next prime is 13345129547. The reversal of 13345129521 is 12592154331.

It is a happy number.

13345129521 is a `hidden beast` number, since 1 + 3 + 3 + 4 + 5 + 129 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9223489521 + 4121640000 = 96039^2 + 64200^2 .

It is not a de Polignac number, because 13345129521 - 2¹⁹ = 13344605233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13345129561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4283970 + ... + 4287083.

It is an arithmetic number, because the mean of its divisors is an integer number (1615643679).

Almost surely, 2^13345129521 is an apocalyptic number.

It is an amenable number.

13345129521 is a deficient number, since it is larger than the sum of its proper divisors (6042594627).

13345129521 is a wasteful number, since it uses less digits than its factorization.

13345129521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8571232 (or 8571229 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The spelling of 13345129521 in words is "thirteen billion, three hundred forty-five million, one hundred twenty-nine thousand, five hundred twenty-one".