188230021 has 6 divisors (see below), whose sum is σ = 218961510. Its totient is φ = 161339976.

The previous prime is 188229991. The next prime is 188230027. The reversal of 188230021 is 120032881.

It can be written as a sum of positive squares in only one way, i.e., 105165025 + 83064996 = 10255^2 + 9114^2 .

It is not a de Polignac number, because 188230021 - 2¹¹ = 188227973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188230027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1920666 + ... + 1920763.

It is an arithmetic number, because the mean of its divisors is an integer number (36493585).

Almost surely, 2^188230021 is an apocalyptic number.

It is an amenable number.

188230021 is a deficient number, since it is larger than the sum of its proper divisors (30731489).

188230021 is an equidigital number, since it uses as much as digits as its factorization.

188230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841443 (or 3841436 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 188230021 is about 13719.6946394590. The cubic root of 188230021 is about 573.0989730426.

The spelling of 188230021 in words is "one hundred eighty-eight million, two hundred thirty thousand, twenty-one".