21703469309 has 2 divisors, whose sum is σ = 21703469310. Its totient is φ = 21703469308.

The previous prime is 21703469279. The next prime is 21703469341. The reversal of 21703469309 is 90396430712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13299163684 + 8404305625 = 115322^2 + 91675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21703469309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21703469309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21703469399) 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, 10851734654 + 10851734655.

It is an arithmetic number, because the mean of its divisors is an integer number (10851734655).

Almost surely, 2^21703469309 is an apocalyptic number.

It is an amenable number.

21703469309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21703469309 is an equidigital number, since it uses as much as digits as its factorization.

21703469309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 44.

The spelling of 21703469309 in words is "twenty-one billion, seven hundred three million, four hundred sixty-nine thousand, three hundred nine".