11123444221 has 4 divisors (see below), whose sum is σ = 11124629152. Its totient is φ = 11122259292.

The previous prime is 11123444209. The next prime is 11123444231. The reversal of 11123444221 is 12244432111.

11123444221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-11123444221 is a prime.

It is a super-2 number, since 2×11123444221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123444231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578271 + ... + 597196.

It is an arithmetic number, because the mean of its divisors is an integer number (2781157288).

Almost surely, 2^11123444221 is an apocalyptic number.

It is an amenable number.

11123444221 is a deficient number, since it is larger than the sum of its proper divisors (1184931).

11123444221 is an equidigital number, since it uses as much as digits as its factorization.

11123444221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1184930.

The product of its digits is 1536, while the sum is 25.

Adding to 11123444221 its reverse (12244432111), we get a palindrome (23367876332).

The spelling of 11123444221 in words is "eleven billion, one hundred twenty-three million, four hundred forty-four thousand, two hundred twenty-one".