4021504065 has 32 divisors (see below), whose sum is σ = 7323724800. Its totient is φ = 2092487040.

The previous prime is 4021504043. The next prime is 4021504073. The reversal of 4021504065 is 5604051204.

4021504065 is a `hidden beast` number, since 40 + 215 + 0 + 406 + 5 = 666.

4021504065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4021504065 - 2¹⁶ = 4021438529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 357745 + ... + 368814.

It is an arithmetic number, because the mean of its divisors is an integer number (228866400).

Almost surely, 2^4021504065 is an apocalyptic number.

4021504065 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4021504065 is a deficient number, since it is larger than the sum of its proper divisors (3302220735).

4021504065 is a wasteful number, since it uses less digits than its factorization.

4021504065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726614 (or 726608 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 4021504065 is about 63415.3298895464. The cubic root of 4021504065 is about 1590.2406008276.

Adding to 4021504065 its reverse (5604051204), we get a palindrome (9625555269).

The spelling of 4021504065 in words is "four billion, twenty-one million, five hundred four thousand, sixty-five".