8188221021 has 16 divisors (see below), whose sum is σ = 11341382400. Its totient is φ = 5248513088.

The previous prime is 8188221001. The next prime is 8188221031. The reversal of 8188221021 is 1201228818.

8188221021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8188221021 - 2¹³ = 8188212829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8188221001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176106 + ... + 217691.

It is an arithmetic number, because the mean of its divisors is an integer number (708836400).

Almost surely, 2^8188221021 is an apocalyptic number.

It is an amenable number.

8188221021 is a deficient number, since it is larger than the sum of its proper divisors (3153161379).

8188221021 is a wasteful number, since it uses less digits than its factorization.

8188221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394068.

The product of its (nonzero) digits is 4096, while the sum is 33.

The square root of 8188221021 is about 90488.7894769291. The cubic root of 8188221021 is about 2015.5636572084.

Adding to 8188221021 its reverse (1201228818), we get a palindrome (9389449839).

The spelling of 8188221021 in words is "eight billion, one hundred eighty-eight million, two hundred twenty-one thousand, twenty-one".