21336076309 has 2 divisors, whose sum is σ = 21336076310. Its totient is φ = 21336076308.

The previous prime is 21336076297. The next prime is 21336076357. The reversal of 21336076309 is 90367063312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21089429284 + 246647025 = 145222^2 + 15705^2 .

It is a cyclic number.

It is not a de Polignac number, because 21336076309 - 2¹¹ = 21336074261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21336077309) 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, 10668038154 + 10668038155.

It is an arithmetic number, because the mean of its divisors is an integer number (10668038155).

Almost surely, 2^21336076309 is an apocalyptic number.

It is an amenable number.

21336076309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21336076309 is an equidigital number, since it uses as much as digits as its factorization.

21336076309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 40.

The spelling of 21336076309 in words is "twenty-one billion, three hundred thirty-six million, seventy-six thousand, three hundred nine".