11217621 has 8 divisors (see below), whose sum is σ = 15035904. Its totient is φ = 7438880.

The previous prime is 11217617. The next prime is 11217653. The reversal of 11217621 is 12671211.

It is a happy number.

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 11217621 - 2² = 11217617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11217601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9216 + ... + 10361.

It is an arithmetic number, because the mean of its divisors is an integer number (1879488).

Almost surely, 2^11217621 is an apocalyptic number.

It is an amenable number.

11217621 is a deficient number, since it is larger than the sum of its proper divisors (3818283).

11217621 is a wasteful number, since it uses less digits than its factorization.

11217621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19771.

The product of its digits is 168, while the sum is 21.

The square root of 11217621 is about 3349.2717118801. The cubic root of 11217621 is about 223.8550627556.

Adding to 11217621 its reverse (12671211), we get a palindrome (23888832).

The spelling of 11217621 in words is "eleven million, two hundred seventeen thousand, six hundred twenty-one".