3856365021 has 8 divisors (see below), whose sum is σ = 5228969760. Its totient is φ = 2527335152.

The previous prime is 3856364999. The next prime is 3856365041. The reversal of 3856365021 is 1205636583.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3856365021 - 2⁷ = 3856364893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3856365041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10893510 + ... + 10893863.

It is an arithmetic number, because the mean of its divisors is an integer number (653621220).

Almost surely, 2^3856365021 is an apocalyptic number.

It is an amenable number.

3856365021 is a deficient number, since it is larger than the sum of its proper divisors (1372604739).

3856365021 is a wasteful number, since it uses less digits than its factorization.

3856365021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21787435.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 3856365021 is about 62099.6378491856. The cubic root of 3856365021 is about 1568.1684486281.

The spelling of 3856365021 in words is "three billion, eight hundred fifty-six million, three hundred sixty-five thousand, twenty-one".