11500053221 has 4 divisors (see below), whose sum is σ = 12105319200. Its totient is φ = 10894787244.

The previous prime is 11500053203. The next prime is 11500053239. The reversal of 11500053221 is 12235000511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11500053203) and next prime (11500053239).

It is a cyclic number.

It is not a de Polignac number, because 11500053221 - 2⁶ = 11500053157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11500053193 and 11500053202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11500053281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302632961 + ... + 302632998.

It is an arithmetic number, because the mean of its divisors is an integer number (3026329800).

Almost surely, 2^11500053221 is an apocalyptic number.

It is an amenable number.

11500053221 is a deficient number, since it is larger than the sum of its proper divisors (605265979).

11500053221 is an equidigital number, since it uses as much as digits as its factorization.

11500053221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605265978.

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 11500053221 its reverse (12235000511), we get a palindrome (23735053732).

The spelling of 11500053221 in words is "eleven billion, five hundred million, fifty-three thousand, two hundred twenty-one".