11211221228 has 12 divisors (see below), whose sum is σ = 19989819360. Its totient is φ = 5499844272.

The previous prime is 11211221221. The next prime is 11211221233. The reversal of 11211221228 is 82212211211.

It is not an unprimeable number, because it can be changed into a prime (11211221221) 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, 26441348 + ... + 26441771.

It is an arithmetic number, because the mean of its divisors is an integer number (1665818280).

Almost surely, 2^11211221228 is an apocalyptic number.

It is an amenable number.

11211221228 is a deficient number, since it is larger than the sum of its proper divisors (8778598132).

11211221228 is a wasteful number, since it uses less digits than its factorization.

11211221228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52883176 (or 52883174 counting only the distinct ones).

The product of its digits is 256, while the sum is 23.

Adding to 11211221228 its reverse (82212211211), we get a palindrome (93423432439).

The spelling of 11211221228 in words is "eleven billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-eight".