21012323089 has 2 divisors, whose sum is σ = 21012323090. Its totient is φ = 21012323088.

The previous prime is 21012323081. The next prime is 21012323159. The reversal of 21012323089 is 98032321012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11023320064 + 9989003025 = 104992^2 + 99945^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012323089 - 2³ = 21012323081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21012323089.

It is not a weakly prime, because it can be changed into another prime (21012323081) 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, 10506161544 + 10506161545.

It is an arithmetic number, because the mean of its divisors is an integer number (10506161545).

Almost surely, 2^21012323089 is an apocalyptic number.

It is an amenable number.

21012323089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012323089 is an equidigital number, since it uses as much as digits as its factorization.

21012323089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 21012323089 in words is "twenty-one billion, twelve million, three hundred twenty-three thousand, eighty-nine".