21210300329 has 2 divisors, whose sum is σ = 21210300330. Its totient is φ = 21210300328.

The previous prime is 21210300323. The next prime is 21210300367. The reversal of 21210300329 is 92300301212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19648469929 + 1561830400 = 140173^2 + 39520^2 .

It is a cyclic number.

It is not a de Polignac number, because 21210300329 - 2²⁰ = 21209251753 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210300323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605150164 + 10605150165.

It is an arithmetic number, because the mean of its divisors is an integer number (10605150165).

Almost surely, 2^21210300329 is an apocalyptic number.

It is an amenable number.

21210300329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210300329 is an equidigital number, since it uses as much as digits as its factorization.

21210300329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21210300329 in words is "twenty-one billion, two hundred ten million, three hundred thousand, three hundred twenty-nine".