23530021789 has 2 divisors, whose sum is σ = 23530021790. Its totient is φ = 23530021788.

The previous prime is 23530021777. The next prime is 23530021807. The reversal of 23530021789 is 98712003532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14360427225 + 9169594564 = 119835^2 + 95758^2 .

It is a cyclic number.

It is not a de Polignac number, because 23530021789 - 2¹¹ = 23530019741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23530021709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11765010894 + 11765010895.

It is an arithmetic number, because the mean of its divisors is an integer number (11765010895).

Almost surely, 2^23530021789 is an apocalyptic number.

It is an amenable number.

23530021789 is a deficient number, since it is larger than the sum of its proper divisors (1).

23530021789 is an equidigital number, since it uses as much as digits as its factorization.

23530021789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 23530021789 in words is "twenty-three billion, five hundred thirty million, twenty-one thousand, seven hundred eighty-nine".