3688304021 has 2 divisors, whose sum is σ = 3688304022. Its totient is φ = 3688304020.

The previous prime is 3688303987. The next prime is 3688304057. The reversal of 3688304021 is 1204038863.

It is a happy number.

3688304021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3610687921 + 77616100 = 60089^2 + 8810^2 .

It is an emirp because it is prime and its reverse (1204038863) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3688304021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3688306021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1844152010 + 1844152011.

It is an arithmetic number, because the mean of its divisors is an integer number (1844152011).

Almost surely, 2^3688304021 is an apocalyptic number.

It is an amenable number.

3688304021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3688304021 is an equidigital number, since it uses as much as digits as its factorization.

3688304021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 3688304021 is about 60731.4088507751. The cubic root of 3688304021 is about 1545.0489290928.

The spelling of 3688304021 in words is "three billion, six hundred eighty-eight million, three hundred four thousand, twenty-one".