8221111228 has 72 divisors (see below), whose sum is σ = 16370286912. Its totient is φ = 3607296000.

The previous prime is 8221111211. The next prime is 8221111231.

8221111228 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 8221111196 and 8221111205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1922733 + ... + 1927003.

It is an arithmetic number, because the mean of its divisors is an integer number (227365096).

Almost surely, 2^8221111228 is an apocalyptic number.

It is an amenable number.

8221111228 is a deficient number, since it is larger than the sum of its proper divisors (8149175684).

8221111228 is a wasteful number, since it uses less digits than its factorization.

8221111228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4435 (or 4422 counting only the distinct ones).

The product of its digits is 1024, while the sum is 28.

The square root of 8221111228 is about 90670.3437073005. The cubic root of 8221111228 is about 2018.2587376558.

It can be divided in two parts, 82211 and 11228, that added together give a palindrome (93439).

The spelling of 8221111228 in words is "eight billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twenty-eight".