3898355021 has 16 divisors (see below), whose sum is σ = 4332182400. Its totient is φ = 3478379520.

The previous prime is 3898355011. The next prime is 3898355029. The reversal of 3898355021 is 1205538983.

3898355021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-3898355021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3898355029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112805 + ... + 143253.

It is an arithmetic number, because the mean of its divisors is an integer number (270761400).

Almost surely, 2^3898355021 is an apocalyptic number.

It is an amenable number.

3898355021 is a deficient number, since it is larger than the sum of its proper divisors (433827379).

3898355021 is a wasteful number, since it uses less digits than its factorization.

3898355021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30676.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 3898355021 is about 62436.8082223939. The cubic root of 3898355021 is about 1573.8395780602.

The spelling of 3898355021 in words is "three billion, eight hundred ninety-eight million, three hundred fifty-five thousand, twenty-one".