11536404221 has 4 divisors (see below), whose sum is σ = 12215016252. Its totient is φ = 10857792192.

The previous prime is 11536404203. The next prime is 11536404251. The reversal of 11536404221 is 12240463511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8345736025 + 3190668196 = 91355^2 + 56486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11536404221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11536404251) 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, 339305990 + ... + 339306023.

It is an arithmetic number, because the mean of its divisors is an integer number (3053754063).

Almost surely, 2^11536404221 is an apocalyptic number.

It is an amenable number.

11536404221 is a deficient number, since it is larger than the sum of its proper divisors (678612031).

11536404221 is an equidigital number, since it uses as much as digits as its factorization.

11536404221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678612030.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 11536404221 its reverse (12240463511), we get a palindrome (23776867732).

The spelling of 11536404221 in words is "eleven billion, five hundred thirty-six million, four hundred four thousand, two hundred twenty-one".