21302113309 has 2 divisors, whose sum is σ = 21302113310. Its totient is φ = 21302113308.

The previous prime is 21302113303. The next prime is 21302113331. The reversal of 21302113309 is 90331120312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17009898084 + 4292215225 = 130422^2 + 65515^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302113309 - 2¹⁷ = 21301982237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21302113303) 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, 10651056654 + 10651056655.

It is an arithmetic number, because the mean of its divisors is an integer number (10651056655).

Almost surely, 2^21302113309 is an apocalyptic number.

It is an amenable number.

21302113309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21302113309 is an equidigital number, since it uses as much as digits as its factorization.

21302113309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 21302113309 in words is "twenty-one billion, three hundred two million, one hundred thirteen thousand, three hundred nine".