11566221213 has 8 divisors (see below), whose sum is σ = 15461895168. Its totient is φ = 7690680704.

The previous prime is 11566221203. The next prime is 11566221239. The reversal of 11566221213 is 31212266511.

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

It is a cyclic number.

It is not a de Polignac number, because 11566221213 - 2⁸ = 11566220957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11566221203) 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, 5032020 + ... + 5034317.

It is an arithmetic number, because the mean of its divisors is an integer number (1932736896).

Almost surely, 2^11566221213 is an apocalyptic number.

It is an amenable number.

11566221213 is a deficient number, since it is larger than the sum of its proper divisors (3895673955).

11566221213 is a wasteful number, since it uses less digits than its factorization.

11566221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10066723.

The product of its digits is 4320, while the sum is 30.

Adding to 11566221213 its reverse (31212266511), we get a palindrome (42778487724).

The spelling of 11566221213 in words is "eleven billion, five hundred sixty-six million, two hundred twenty-one thousand, two hundred thirteen".