11530221211 has 4 divisors (see below), whose sum is σ = 11546258400. Its totient is φ = 11514184024.

The previous prime is 11530221203. The next prime is 11530221221. The reversal of 11530221211 is 11212203511.

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

It is a cyclic number.

It is not a de Polignac number, because 11530221211 - 2³ = 11530221203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11530221221) 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, 8017516 + ... + 8018953.

It is an arithmetic number, because the mean of its divisors is an integer number (2886564600).

Almost surely, 2^11530221211 is an apocalyptic number.

11530221211 is a deficient number, since it is larger than the sum of its proper divisors (16037189).

11530221211 is an equidigital number, since it uses as much as digits as its factorization.

11530221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16037188.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 11530221211 its reverse (11212203511), we get a palindrome (22742424722).

The spelling of 11530221211 in words is "eleven billion, five hundred thirty million, two hundred twenty-one thousand, two hundred eleven".