21830798173 has 2 divisors, whose sum is σ = 21830798174. Its totient is φ = 21830798172.

The previous prime is 21830798153. The next prime is 21830798177. The reversal of 21830798173 is 37189703812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21375317209 + 455480964 = 146203^2 + 21342^2 .

It is a cyclic number.

It is not a de Polignac number, because 21830798173 - 2⁹ = 21830797661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21830798177) 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, 10915399086 + 10915399087.

It is an arithmetic number, because the mean of its divisors is an integer number (10915399087).

Almost surely, 2^21830798173 is an apocalyptic number.

It is an amenable number.

21830798173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21830798173 is an equidigital number, since it uses as much as digits as its factorization.

21830798173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 21830798173 in words is "twenty-one billion, eight hundred thirty million, seven hundred ninety-eight thousand, one hundred seventy-three".