185502200021 has 2 divisors, whose sum is σ = 185502200022. Its totient is φ = 185502200020.

The previous prime is 185502200003. The next prime is 185502200069. The reversal of 185502200021 is 120002205581.

185502200021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101833744996 + 83668455025 = 319114^2 + 289255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185502200021 is a prime.

It is a super-2 number, since 2×185502200021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185502200071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92751100010 + 92751100011.

It is an arithmetic number, because the mean of its divisors is an integer number (92751100011).

Almost surely, 2^185502200021 is an apocalyptic number.

It is an amenable number.

185502200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

185502200021 is an equidigital number, since it uses as much as digits as its factorization.

185502200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 26.

The spelling of 185502200021 in words is "one hundred eighty-five billion, five hundred two million, two hundred thousand, twenty-one".