3845608021 has 2 divisors, whose sum is σ = 3845608022. Its totient is φ = 3845608020.

The previous prime is 3845608007. The next prime is 3845608093. The reversal of 3845608021 is 1208065483.

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., 2122444900 + 1723163121 = 46070^2 + 41511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3845608021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3845609021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1922804010 + 1922804011.

It is an arithmetic number, because the mean of its divisors is an integer number (1922804011).

Almost surely, 2^3845608021 is an apocalyptic number.

It is an amenable number.

3845608021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3845608021 is an equidigital number, since it uses as much as digits as its factorization.

3845608021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 3845608021 is about 62012.9665553907. The cubic root of 3845608021 is about 1566.7090002494.

The spelling of 3845608021 in words is "three billion, eight hundred forty-five million, six hundred eight thousand, twenty-one".