21204203054329 has 2 divisors, whose sum is σ = 21204203054330. Its totient is φ = 21204203054328.

The previous prime is 21204203054299. The next prime is 21204203054347. The reversal of 21204203054329 is 92345030240212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15650545229929 + 5553657824400 = 3956077^2 + 2356620^2 .

It is a cyclic number.

It is not a de Polignac number, because 21204203054329 - 2⁵ = 21204203054297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21204203054429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10602101527164 + 10602101527165.

It is an arithmetic number, because the mean of its divisors is an integer number (10602101527165).

Almost surely, 2^{21204203054329} is an apocalyptic number.

It is an amenable number.

21204203054329 is a deficient number, since it is larger than the sum of its proper divisors (1).

21204203054329 is an equidigital number, since it uses as much as digits as its factorization.

21204203054329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 21204203054329 in words is "twenty-one trillion, two hundred four billion, two hundred three million, fifty-four thousand, three hundred twenty-nine".