188303055721 has 27 divisors (see below), whose sum is σ = 209553875517. Its totient is φ = 169079991960.

The previous prime is 188303055713. The next prime is 188303055727. The reversal of 188303055721 is 127550303881.

The square root of 188303055721 is 433939.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 188303055721 - 2³ = 188303055713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188303055727) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 491652696 + ... + 491653078.

Almost surely, 2^188303055721 is an apocalyptic number.

188303055721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

188303055721 is the 433939-th square number.

188303055721 is the 216970-th centered octagonal number.

It is an amenable number.

188303055721 is a deficient number, since it is larger than the sum of its proper divisors (21250819796).

188303055721 is an frugal number, since it uses more digits than its factorization.

188303055721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 188303055721 in words is "one hundred eighty-eight billion, three hundred three million, fifty-five thousand, seven hundred twenty-one".