21316122089 has 2 divisors, whose sum is σ = 21316122090. Its totient is φ = 21316122088.

The previous prime is 21316122073. The next prime is 21316122103. The reversal of 21316122089 is 98022161312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20012912089 + 1303210000 = 141467^2 + 36100^2 .

It is a cyclic number.

It is not a de Polignac number, because 21316122089 - 2⁴ = 21316122073 is a prime.

It is not a weakly prime, because it can be changed into another prime (21316122019) 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, 10658061044 + 10658061045.

It is an arithmetic number, because the mean of its divisors is an integer number (10658061045).

Almost surely, 2^21316122089 is an apocalyptic number.

It is an amenable number.

21316122089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21316122089 is an equidigital number, since it uses as much as digits as its factorization.

21316122089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 21316122089 in words is "twenty-one billion, three hundred sixteen million, one hundred twenty-two thousand, eighty-nine".