11543365221 has 16 divisors (see below), whose sum is σ = 15605166720. Its totient is φ = 7589191680.

The previous prime is 11543365217. The next prime is 11543365231. The reversal of 11543365221 is 12256334511.

It is not a de Polignac number, because 11543365221 - 2² = 11543365217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11543365201) 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, 3036 + ... + 151973.

It is an arithmetic number, because the mean of its divisors is an integer number (975322920).

Almost surely, 2^11543365221 is an apocalyptic number.

It is an amenable number.

11543365221 is a deficient number, since it is larger than the sum of its proper divisors (4061801499).

11543365221 is a wasteful number, since it uses less digits than its factorization.

11543365221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155356.

The product of its digits is 21600, while the sum is 33.

Adding to 11543365221 its reverse (12256334511), we get a palindrome (23799699732).

The spelling of 11543365221 in words is "eleven billion, five hundred forty-three million, three hundred sixty-five thousand, two hundred twenty-one".