11321221 has 4 divisors (see below), whose sum is σ = 11813472. Its totient is φ = 10828972.

The previous prime is 11321203. The next prime is 11321243. The reversal of 11321221 is 12212311.

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 11321221 - 2⁹ = 11320709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11321251) 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, 246091 + ... + 246136.

It is an arithmetic number, because the mean of its divisors is an integer number (2953368).

Almost surely, 2^11321221 is an apocalyptic number.

It is an amenable number.

11321221 is a deficient number, since it is larger than the sum of its proper divisors (492251).

11321221 is an equidigital number, since it uses as much as digits as its factorization.

11321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492250.

The product of its digits is 24, while the sum is 13.

The square root of 11321221 is about 3364.7022156500. The cubic root of 11321221 is about 224.5420876345.

Adding to 11321221 its reverse (12212311), we get a palindrome (23533532).

The spelling of 11321221 in words is "eleven million, three hundred twenty-one thousand, two hundred twenty-one".