11713221 has 48 divisors (see below), whose sum is σ = 20027520. Its totient is φ = 6739200.

The previous prime is 11713217. The next prime is 11713237. The reversal of 11713221 is 12231711.

It is a happy number.

It is not a de Polignac number, because 11713221 - 2² = 11713217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11713194 and 11713203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11713021) 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 47 ways as a sum of consecutive naturals, for example, 77496 + ... + 77646.

It is an arithmetic number, because the mean of its divisors is an integer number (417240).

Almost surely, 2^11713221 is an apocalyptic number.

It is an amenable number.

11713221 is a deficient number, since it is larger than the sum of its proper divisors (8314299).

11713221 is a wasteful number, since it uses less digits than its factorization.

11713221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 184 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 11713221 is about 3422.4583269925. The cubic root of 11713221 is about 227.1043463165.

Adding to 11713221 its reverse (12231711), we get a palindrome (23944932).

The spelling of 11713221 in words is "eleven million, seven hundred thirteen thousand, two hundred twenty-one".