8221172018312 has 16 divisors (see below), whose sum is σ = 16816033674000. Its totient is φ = 3736896371920.

The previous prime is 8221172018309. The next prime is 8221172018327. The reversal of 8221172018312 is 2138102711228.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46711204562 + ... + 46711204737.

It is an arithmetic number, because the mean of its divisors is an integer number (1051002104625).

Almost surely, 2^{8221172018312} is an apocalyptic number.

It is an amenable number.

8221172018312 is an abundant number, since it is smaller than the sum of its proper divisors (8594861655688).

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

8221172018312 is a wasteful number, since it uses less digits than its factorization.

8221172018312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93422409316 (or 93422409312 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 38.

The spelling of 8221172018312 in words is "eight trillion, two hundred twenty-one billion, one hundred seventy-two million, eighteen thousand, three hundred twelve".