11717221 has 4 divisors (see below), whose sum is σ = 11787552. Its totient is φ = 11646892.

The previous prime is 11717219. The next prime is 11717239. The reversal of 11717221 is 12271711.

11717221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 11717221 - 2¹ = 11717219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11717192 and 11717201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11717261) 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, 34915 + ... + 35248.

It is an arithmetic number, because the mean of its divisors is an integer number (2946888).

Almost surely, 2^11717221 is an apocalyptic number.

It is an amenable number.

11717221 is a deficient number, since it is larger than the sum of its proper divisors (70331).

11717221 is an equidigital number, since it uses as much as digits as its factorization.

11717221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70330.

The product of its digits is 196, while the sum is 22.

The square root of 11717221 is about 3423.0426523781. The cubic root of 11717221 is about 227.1301949992.

Adding to 11717221 its reverse (12271711), we get a palindrome (23988932).

The spelling of 11717221 in words is "eleven million, seven hundred seventeen thousand, two hundred twenty-one".