21204302401 has 2 divisors, whose sum is σ = 21204302402. Its totient is φ = 21204302400.

The previous prime is 21204302369. The next prime is 21204302473. The reversal of 21204302401 is 10420340212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21068812801 + 135489600 = 145151^2 + 11640^2 .

It is a cyclic number.

It is not a de Polignac number, because 21204302401 - 2⁵ = 21204302369 is a prime.

It is not a weakly prime, because it can be changed into another prime (21204302491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10602151200 + 10602151201.

It is an arithmetic number, because the mean of its divisors is an integer number (10602151201).

Almost surely, 2^21204302401 is an apocalyptic number.

It is an amenable number.

21204302401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21204302401 is an equidigital number, since it uses as much as digits as its factorization.

21204302401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21204302401 its reverse (10420340212), we get a palindrome (31624642613).

The spelling of 21204302401 in words is "twenty-one billion, two hundred four million, three hundred two thousand, four hundred one".