188322221 has 2 divisors, whose sum is σ = 188322222. Its totient is φ = 188322220.

The previous prime is 188322181. The next prime is 188322227. The reversal of 188322221 is 122223881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139476100 + 48846121 = 11810^2 + 6989^2 .

It is a cyclic number.

It is not a de Polignac number, because 188322221 - 2¹⁴ = 188305837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188322227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94161110 + 94161111.

It is an arithmetic number, because the mean of its divisors is an integer number (94161111).

Almost surely, 2^188322221 is an apocalyptic number.

It is an amenable number.

188322221 is a deficient number, since it is larger than the sum of its proper divisors (1).

188322221 is an equidigital number, since it uses as much as digits as its factorization.

188322221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 29.

The square root of 188322221 is about 13723.0543611836. The cubic root of 188322221 is about 573.1925307368.

The spelling of 188322221 in words is "one hundred eighty-eight million, three hundred twenty-two thousand, two hundred twenty-one".