11224212221 has 4 divisors (see below), whose sum is σ = 11712221472. Its totient is φ = 10736202972.

The previous prime is 11224212187. The next prime is 11224212271. The reversal of 11224212221 is 12221242211.

It is a happy number.

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 11224212221 - 2⁶ = 11224212157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11224212193 and 11224212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11224212271) 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, 244004591 + ... + 244004636.

It is an arithmetic number, because the mean of its divisors is an integer number (2928055368).

Almost surely, 2^11224212221 is an apocalyptic number.

It is an amenable number.

11224212221 is a deficient number, since it is larger than the sum of its proper divisors (488009251).

11224212221 is an equidigital number, since it uses as much as digits as its factorization.

11224212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488009250.

The product of its digits is 256, while the sum is 20.

Adding to 11224212221 its reverse (12221242211), we get a palindrome (23445454432).

The spelling of 11224212221 in words is "eleven billion, two hundred twenty-four million, two hundred twelve thousand, two hundred twenty-one".