11500221 has 16 divisors (see below), whose sum is σ = 15966720. Its totient is φ = 7356720.

The previous prime is 11500219. The next prime is 11500249. The reversal of 11500221 is 12200511.

It is not a de Polignac number, because 11500221 - 2¹ = 11500219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11500197 and 11500206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11500261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6856 + ... + 8366.

It is an arithmetic number, because the mean of its divisors is an integer number (997920).

Almost surely, 2^11500221 is an apocalyptic number.

It is an amenable number.

11500221 is a deficient number, since it is larger than the sum of its proper divisors (4466499).

11500221 is a wasteful number, since it uses less digits than its factorization.

11500221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 11500221 is about 3391.1975760784. The cubic root of 11500221 is about 225.7193176673.

Adding to 11500221 its reverse (12200511), we get a palindrome (23700732).

The spelling of 11500221 in words is "eleven million, five hundred thousand, two hundred twenty-one".