188850005021 has 4 divisors (see below), whose sum is σ = 188851950012. Its totient is φ = 188848060032.

The previous prime is 188850005017. The next prime is 188850005027. The reversal of 188850005021 is 120500058881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120500058881 = 8719 ⋅13820399.

It can be written as a sum of positive squares in 2 ways, for example, as 122507700121 + 66342304900 = 350011^2 + 257570^2 .

It is a cyclic number.

It is not a de Polignac number, because 188850005021 - 2² = 188850005017 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 (188850005027) 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, 818750 + ... + 1023743.

It is an arithmetic number, because the mean of its divisors is an integer number (47212987503).

Almost surely, 2^188850005021 is an apocalyptic number.

It is an amenable number.

188850005021 is a deficient number, since it is larger than the sum of its proper divisors (1944991).

188850005021 is a wasteful number, since it uses less digits than its factorization.

188850005021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944990.

The product of its (nonzero) digits is 25600, while the sum is 38.

The spelling of 188850005021 in words is "one hundred eighty-eight billion, eight hundred fifty million, five thousand, twenty-one".