13445015521 has 8 divisors (see below), whose sum is σ = 15626168640. Its totient is φ = 11328971568.

The previous prime is 13445015513. The next prime is 13445015629. The reversal of 13445015521 is 12551054431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13445015521 - 2³ = 13445015513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13445012521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16276846 + ... + 16277671.

It is an arithmetic number, because the mean of its divisors is an integer number (1953271080).

Almost surely, 2^13445015521 is an apocalyptic number.

It is an amenable number.

13445015521 is a deficient number, since it is larger than the sum of its proper divisors (2181153119).

13445015521 is an equidigital number, since it uses as much as digits as its factorization.

13445015521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32554583.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 13445015521 its reverse (12551054431), we get a palindrome (25996069952).

The spelling of 13445015521 in words is "thirteen billion, four hundred forty-five million, fifteen thousand, five hundred twenty-one".