11221322221 has 4 divisors (see below), whose sum is σ = 11268273600. Its totient is φ = 11174370844.

The previous prime is 11221322197. The next prime is 11221322251. The reversal of 11221322221 is 12222312211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12222312211 = 4219 ⋅2896969.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221322221 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 (11221322251) 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, 23475331 + ... + 23475808.

It is an arithmetic number, because the mean of its divisors is an integer number (2817068400).

Almost surely, 2^11221322221 is an apocalyptic number.

It is an amenable number.

11221322221 is a deficient number, since it is larger than the sum of its proper divisors (46951379).

11221322221 is an equidigital number, since it uses as much as digits as its factorization.

11221322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46951378.

The product of its digits is 192, while the sum is 19.

Adding to 11221322221 its reverse (12222312211), we get a palindrome (23443634432).

The spelling of 11221322221 in words is "eleven billion, two hundred twenty-one million, three hundred twenty-two thousand, two hundred twenty-one".