11221120221 has 4 divisors (see below), whose sum is σ = 14961493632. Its totient is φ = 7480746812.

The previous prime is 11221120151. The next prime is 11221120223. The reversal of 11221120221 is 12202112211.

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 11221120221 - 2⁷ = 11221120093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11221120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221120223) 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, 1870186701 + ... + 1870186706.

It is an arithmetic number, because the mean of its divisors is an integer number (3740373408).

Almost surely, 2^11221120221 is an apocalyptic number.

It is an amenable number.

11221120221 is a deficient number, since it is larger than the sum of its proper divisors (3740373411).

11221120221 is an equidigital number, since it uses as much as digits as its factorization.

11221120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740373410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11221120221 its reverse (12202112211), we get a palindrome (23423232432).

The spelling of 11221120221 in words is "eleven billion, two hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".