11303445521 has 4 divisors (see below), whose sum is σ = 11516718132. Its totient is φ = 11090172912.

The previous prime is 11303445509. The next prime is 11303445529. The reversal of 11303445521 is 12554430311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12554430311 = 541 ⋅23205971.

It can be written as a sum of positive squares in 2 ways, for example, as 6565050625 + 4738394896 = 81025^2 + 68836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11303445521 is a prime.

It is a super-2 number, since 2×11303445521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11303445529) 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, 106636226 + ... + 106636331.

It is an arithmetic number, because the mean of its divisors is an integer number (2879179533).

Almost surely, 2^11303445521 is an apocalyptic number.

It is an amenable number.

11303445521 is a deficient number, since it is larger than the sum of its proper divisors (213272611).

11303445521 is an equidigital number, since it uses as much as digits as its factorization.

11303445521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213272610.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 11303445521 its reverse (12554430311), we get a palindrome (23857875832).

The spelling of 11303445521 in words is "eleven billion, three hundred three million, four hundred forty-five thousand, five hundred twenty-one".