21468251089 has 2 divisors, whose sum is σ = 21468251090. Its totient is φ = 21468251088.

The previous prime is 21468251081. The next prime is 21468251159. The reversal of 21468251089 is 98015286412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721398225 + 5746852864 = 125385^2 + 75808^2 .

It is a cyclic number.

It is not a de Polignac number, because 21468251089 - 2³ = 21468251081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21468251081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734125544 + 10734125545.

It is an arithmetic number, because the mean of its divisors is an integer number (10734125545).

Almost surely, 2^21468251089 is an apocalyptic number.

It is an amenable number.

21468251089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21468251089 is an equidigital number, since it uses as much as digits as its factorization.

21468251089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 21468251089 in words is "twenty-one billion, four hundred sixty-eight million, two hundred fifty-one thousand, eighty-nine".