11445387521 has 16 divisors (see below), whose sum is σ = 11711044800. Its totient is φ = 11182353600.

The previous prime is 11445387487. The next prime is 11445387557. The reversal of 11445387521 is 12578354411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11445387521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11445387571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10490186 + ... + 10491276.

It is an arithmetic number, because the mean of its divisors is an integer number (731940300).

Almost surely, 2^11445387521 is an apocalyptic number.

It is an amenable number.

11445387521 is a deficient number, since it is larger than the sum of its proper divisors (265657279).

11445387521 is a wasteful number, since it uses less digits than its factorization.

11445387521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080.

The product of its digits is 134400, while the sum is 41.

The spelling of 11445387521 in words is "eleven billion, four hundred forty-five million, three hundred eighty-seven thousand, five hundred twenty-one".