8221238312 has 128 divisors (see below), whose sum is σ = 18968463360. Its totient is φ = 3264518400.

The previous prime is 8221238303. The next prime is 8221238323. The reversal of 8221238312 is 2138321228.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5665187 + ... + 5666637.

It is an arithmetic number, because the mean of its divisors is an integer number (148191120).

Almost surely, 2^8221238312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8221238312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9484231680).

8221238312 is an abundant number, since it is smaller than the sum of its proper divisors (10747225048).

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

8221238312 is a wasteful number, since it uses less digits than its factorization.

8221238312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1619 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 8221238312 is about 90671.0445070531. The cubic root of 8221238312 is about 2018.2691371856.

The spelling of 8221238312 in words is "eight billion, two hundred twenty-one million, two hundred thirty-eight thousand, three hundred twelve".