11013531521 has 8 divisors (see below), whose sum is σ = 11422018920. Its totient is φ = 10606958208.

The previous prime is 11013531467. The next prime is 11013531527. The reversal of 11013531521 is 12513531011.

It can be written as a sum of positive squares in 4 ways, for example, as 1592887921 + 9420643600 = 39911^2 + 97060^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11013531521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11013531527) 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, 466796 + ... + 489821.

It is an arithmetic number, because the mean of its divisors is an integer number (1427752365).

Almost surely, 2^11013531521 is an apocalyptic number.

It is an amenable number.

11013531521 is a deficient number, since it is larger than the sum of its proper divisors (408487399).

11013531521 is an equidigital number, since it uses as much as digits as its factorization.

11013531521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957043.

The product of its (nonzero) digits is 450, while the sum is 23.

The spelling of 11013531521 in words is "eleven billion, thirteen million, five hundred thirty-one thousand, five hundred twenty-one".