3188888221 has 2 divisors, whose sum is σ = 3188888222. Its totient is φ = 3188888220.

The previous prime is 3188888189. The next prime is 3188888233. The reversal of 3188888221 is 1228888813.

3188888221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2341204996 + 847683225 = 48386^2 + 29115^2 .

It is a cyclic number.

It is not a de Polignac number, because 3188888221 - 2⁵ = 3188888189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3188888281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1594444110 + 1594444111.

It is an arithmetic number, because the mean of its divisors is an integer number (1594444111).

Almost surely, 2^3188888221 is an apocalyptic number.

It is an amenable number.

3188888221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3188888221 is an equidigital number, since it uses as much as digits as its factorization.

3188888221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393216, while the sum is 49.

The square root of 3188888221 is about 56470.2419066892. The cubic root of 3188888221 is about 1471.9049487018.

The spelling of 3188888221 in words is "three billion, one hundred eighty-eight million, eight hundred eighty-eight thousand, two hundred twenty-one".