188799221 has 8 divisors (see below), whose sum is σ = 203834904. Its totient is φ = 173836800.

The previous prime is 188799217. The next prime is 188799223. The reversal of 188799221 is 122997881.

188799221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19018321 + 169780900 = 4361^2 + 13030^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 188799221 - 2² = 188799217 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188799223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12896 + ... + 23321.

It is an arithmetic number, because the mean of its divisors is an integer number (25479363).

Almost surely, 2^188799221 is an apocalyptic number.

It is an amenable number.

188799221 is a deficient number, since it is larger than the sum of its proper divisors (15035683).

188799221 is a wasteful number, since it uses less digits than its factorization.

188799221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36631.

The product of its digits is 145152, while the sum is 47.

The square root of 188799221 is about 13740.4228828665. The cubic root of 188799221 is about 573.6760677975.

The spelling of 188799221 in words is "one hundred eighty-eight million, seven hundred ninety-nine thousand, two hundred twenty-one".