11663221 has 4 divisors (see below), whose sum is σ = 11748492. Its totient is φ = 11577952.

The previous prime is 11663219. The next prime is 11663227. The reversal of 11663221 is 12236611.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4040100 + 7623121 = 2010^2 + 2761^2 .

It is a cyclic number.

It is not a de Polignac number, because 11663221 - 2¹ = 11663219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11663192 and 11663201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11663227) 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, 42430 + ... + 42703.

It is an arithmetic number, because the mean of its divisors is an integer number (2937123).

Almost surely, 2^11663221 is an apocalyptic number.

It is an amenable number.

11663221 is a deficient number, since it is larger than the sum of its proper divisors (85271).

11663221 is an equidigital number, since it uses as much as digits as its factorization.

11663221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85270.

The product of its digits is 432, while the sum is 22.

The square root of 11663221 is about 3415.1458241194. The cubic root of 11663221 is about 226.7807401110.

Adding to 11663221 its reverse (12236611), we get a palindrome (23899832).

The spelling of 11663221 in words is "eleven million, six hundred sixty-three thousand, two hundred twenty-one".