21303185929 has 2 divisors, whose sum is σ = 21303185930. Its totient is φ = 21303185928.

The previous prime is 21303185923. The next prime is 21303185993. The reversal of 21303185929 is 92958130312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10990377225 + 10312808704 = 104835^2 + 101552^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303185929 - 2¹⁹ = 21302661641 is a prime.

It is not a weakly prime, because it can be changed into another prime (21303185923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651592964 + 10651592965.

It is an arithmetic number, because the mean of its divisors is an integer number (10651592965).

Almost surely, 2^21303185929 is an apocalyptic number.

It is an amenable number.

21303185929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303185929 is an equidigital number, since it uses as much as digits as its factorization.

21303185929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 21303185929 in words is "twenty-one billion, three hundred three million, one hundred eighty-five thousand, nine hundred twenty-nine".