21303573899 has 2 divisors, whose sum is σ = 21303573900. Its totient is φ = 21303573898.

The previous prime is 21303573887. The next prime is 21303573989. The reversal of 21303573899 is 99837530312.

Together with next prime (21303573989) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303573899 is a prime.

It is not a weakly prime, because it can be changed into another prime (21303573859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651786949 + 10651786950.

It is an arithmetic number, because the mean of its divisors is an integer number (10651786950).

Almost surely, 2^21303573899 is an apocalyptic number.

21303573899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303573899 is an equidigital number, since it uses as much as digits as its factorization.

21303573899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 21303573899 in words is "twenty-one billion, three hundred three million, five hundred seventy-three thousand, eight hundred ninety-nine".