21322502309 has 2 divisors, whose sum is σ = 21322502310. Its totient is φ = 21322502308.

The previous prime is 21322502303. The next prime is 21322502371. The reversal of 21322502309 is 90320522312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11416281409 + 9906220900 = 106847^2 + 99530^2 .

It is a cyclic number.

It is not a de Polignac number, because 21322502309 - 2²⁰ = 21321453733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21322502303) 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, 10661251154 + 10661251155.

It is an arithmetic number, because the mean of its divisors is an integer number (10661251155).

Almost surely, 2^21322502309 is an apocalyptic number.

It is an amenable number.

21322502309 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322502309 is an equidigital number, since it uses as much as digits as its factorization.

21322502309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 21322502309 in words is "twenty-one billion, three hundred twenty-two million, five hundred two thousand, three hundred nine".