8221221228 has 24 divisors (see below), whose sum is σ = 20926745280. Its totient is φ = 2491279120.

The previous prime is 8221221187. The next prime is 8221221241.

8221221228 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 8221221195 and 8221221204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31140858 + ... + 31141121.

It is an arithmetic number, because the mean of its divisors is an integer number (871947720).

Almost surely, 2^8221221228 is an apocalyptic number.

It is an amenable number.

8221221228 is an abundant number, since it is smaller than the sum of its proper divisors (12705524052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8221221228 is a wasteful number, since it uses less digits than its factorization.

8221221228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62281997 (or 62281995 counting only the distinct ones).

The product of its digits is 4096, while the sum is 30.

The square root of 8221221228 is about 90670.9502983177. The cubic root of 8221221228 is about 2018.2677391750.

The spelling of 8221221228 in words is "eight billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-eight".