19604021 has 2 divisors, whose sum is σ = 19604022. Its totient is φ = 19604020.

The previous prime is 19603979. The next prime is 19604041. The reversal of 19604021 is 12040691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10080625 + 9523396 = 3175^2 + 3086^2 .

It is a cyclic number.

It is not a de Polignac number, because 19604021 - 2⁶ = 19603957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19604041) 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, 9802010 + 9802011.

It is an arithmetic number, because the mean of its divisors is an integer number (9802011).

Almost surely, 2^19604021 is an apocalyptic number.

It is an amenable number.

19604021 is a deficient number, since it is larger than the sum of its proper divisors (1).

19604021 is an equidigital number, since it uses as much as digits as its factorization.

19604021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 19604021 is about 4427.6428266065. The cubic root of 19604021 is about 269.6383865029.

The spelling of 19604021 in words is "nineteen million, six hundred four thousand, twenty-one".