21303399307 has 2 divisors, whose sum is σ = 21303399308. Its totient is φ = 21303399306.

The previous prime is 21303399289. The next prime is 21303399311. The reversal of 21303399307 is 70399330312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303399307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21303399307.

It is not a weakly prime, because it can be changed into another prime (21303399347) 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, 10651699653 + 10651699654.

It is an arithmetic number, because the mean of its divisors is an integer number (10651699654).

Almost surely, 2^21303399307 is an apocalyptic number.

21303399307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303399307 is an equidigital number, since it uses as much as digits as its factorization.

21303399307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 40.

The spelling of 21303399307 in words is "twenty-one billion, three hundred three million, three hundred ninety-nine thousand, three hundred seven".