11103315521 has 4 divisors (see below), whose sum is σ = 11486188500. Its totient is φ = 10720442544.

The previous prime is 11103315511. The next prime is 11103315523. The reversal of 11103315521 is 12551330111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12551330111 = 337 ⋅37244303.

It can be written as a sum of positive squares in 2 ways, for example, as 7982529025 + 3120786496 = 89345^2 + 55864^2 .

It is a cyclic number.

It is not a de Polignac number, because 11103315521 - 2²² = 11099121217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11103315523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191436446 + ... + 191436503.

It is an arithmetic number, because the mean of its divisors is an integer number (2871547125).

Almost surely, 2^11103315521 is an apocalyptic number.

It is an amenable number.

11103315521 is a deficient number, since it is larger than the sum of its proper divisors (382872979).

11103315521 is an equidigital number, since it uses as much as digits as its factorization.

11103315521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382872978.

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

Adding to 11103315521 its reverse (12551330111), we get a palindrome (23654645632).

The spelling of 11103315521 in words is "eleven billion, one hundred three million, three hundred fifteen thousand, five hundred twenty-one".