21830798177 has 2 divisors, whose sum is σ = 21830798178. Its totient is φ = 21830798176.

The previous prime is 21830798173. The next prime is 21830798179. The reversal of 21830798177 is 77189703812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13444634401 + 8386163776 = 115951^2 + 91576^2 .

It is a cyclic number.

It is not a de Polignac number, because 21830798177 - 2² = 21830798173 is a prime.

Together with 21830798179, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21830798173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10915399088 + 10915399089.

It is an arithmetic number, because the mean of its divisors is an integer number (10915399089).

Almost surely, 2^21830798177 is an apocalyptic number.

It is an amenable number.

21830798177 is a deficient number, since it is larger than the sum of its proper divisors (1).

21830798177 is an equidigital number, since it uses as much as digits as its factorization.

21830798177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The spelling of 21830798177 in words is "twenty-one billion, eight hundred thirty million, seven hundred ninety-eight thousand, one hundred seventy-seven".