204624421 has 2 divisors, whose sum is σ = 204624422. Its totient is φ = 204624420.

The previous prime is 204624419. The next prime is 204624437. The reversal of 204624421 is 124426402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204175521 + 448900 = 14289^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 204624421 - 2¹ = 204624419 is a prime.

Together with 204624419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204627421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102312210 + 102312211.

It is an arithmetic number, because the mean of its divisors is an integer number (102312211).

Almost surely, 2^204624421 is an apocalyptic number.

It is an amenable number.

204624421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204624421 is an equidigital number, since it uses as much as digits as its factorization.

204624421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 204624421 is about 14304.6992628297. The cubic root of 204624421 is about 589.2765440784.

The spelling of 204624421 in words is "two hundred four million, six hundred twenty-four thousand, four hundred twenty-one".