8861188221 has 24 divisors (see below), whose sum is σ = 12900567680. Its totient is φ = 5860965600.

The previous prime is 8861188183. The next prime is 8861188223. The reversal of 8861188221 is 1228811688.

8861188221 is a `hidden beast` number, since 8 + 8 + 611 + 8 + 8 + 2 + 21 = 666.

It is not a de Polignac number, because 8861188221 - 2⁷ = 8861188093 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8861188223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 708936 + ... + 721326.

Almost surely, 2^8861188221 is an apocalyptic number.

It is an amenable number.

8861188221 is a deficient number, since it is larger than the sum of its proper divisors (4039379459).

8861188221 is a wasteful number, since it uses less digits than its factorization.

8861188221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13017 (or 13014 counting only the distinct ones).

The product of its digits is 98304, while the sum is 45.

The square root of 8861188221 is about 94133.8845528006. The cubic root of 8861188221 is about 2069.3342877852.

The spelling of 8861188221 in words is "eight billion, eight hundred sixty-one million, one hundred eighty-eight thousand, two hundred twenty-one".