188814221 has 2 divisors, whose sum is σ = 188814222. Its totient is φ = 188814220.

The previous prime is 188814209. The next prime is 188814253. The reversal of 188814221 is 122418881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152646025 + 36168196 = 12355^2 + 6014^2 .

It is a cyclic number.

It is not a de Polignac number, because 188814221 - 2²² = 184619917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188814721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94407110 + 94407111.

It is an arithmetic number, because the mean of its divisors is an integer number (94407111).

Almost surely, 2^188814221 is an apocalyptic number.

It is an amenable number.

188814221 is a deficient number, since it is larger than the sum of its proper divisors (1).

188814221 is an equidigital number, since it uses as much as digits as its factorization.

188814221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8192, while the sum is 35.

The square root of 188814221 is about 13740.9687067543. The cubic root of 188814221 is about 573.6912601503.

The spelling of 188814221 in words is "one hundred eighty-eight million, eight hundred fourteen thousand, two hundred twenty-one".