11221203221 has 4 divisors (see below), whose sum is σ = 11221503744. Its totient is φ = 11220902700.

The previous prime is 11221203197. The next prime is 11221203229. The reversal of 11221203221 is 12230212211.

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 11221203221 - 2¹⁸ = 11220941077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11221203221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221203229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84725 + ... + 172106.

It is an arithmetic number, because the mean of its divisors is an integer number (2805375936).

Almost surely, 2^11221203221 is an apocalyptic number.

It is an amenable number.

11221203221 is a deficient number, since it is larger than the sum of its proper divisors (300523).

11221203221 is an equidigital number, since it uses as much as digits as its factorization.

11221203221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300522.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 11221203221 its reverse (12230212211), we get a palindrome (23451415432).

The spelling of 11221203221 in words is "eleven billion, two hundred twenty-one million, two hundred three thousand, two hundred twenty-one".