188544411221 has 4 divisors (see below), whose sum is σ = 188549255244. Its totient is φ = 188539567200.

The previous prime is 188544411193. The next prime is 188544411281. The reversal of 188544411221 is 122114445881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101831830321 + 86712580900 = 319111^2 + 294470^2 .

It is a cyclic number.

It is not a de Polignac number, because 188544411221 - 2⁶ = 188544411157 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 (188544411281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2363150 + ... + 2441631.

It is an arithmetic number, because the mean of its divisors is an integer number (47137313811).

Almost surely, 2^188544411221 is an apocalyptic number.

It is an amenable number.

188544411221 is a deficient number, since it is larger than the sum of its proper divisors (4844023).

188544411221 is an equidigital number, since it uses as much as digits as its factorization.

188544411221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4844022.

The product of its digits is 81920, while the sum is 41.

The spelling of 188544411221 in words is "one hundred eighty-eight billion, five hundred forty-four million, four hundred eleven thousand, two hundred twenty-one".