4164021 has 16 divisors (see below), whose sum is σ = 6494400. Its totient is φ = 2629584.

The previous prime is 4164019. The next prime is 4164047. The reversal of 4164021 is 1204614.

4164021 is a `hidden beast` number, since 4 + 1 + 640 + 21 = 666.

It is not a de Polignac number, because 4164021 - 2¹ = 4164019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4163985 and 4164003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4164071) 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, 3546 + ... + 4571.

It is an arithmetic number, because the mean of its divisors is an integer number (405900).

Almost surely, 2^4164021 is an apocalyptic number.

It is an amenable number.

4164021 is a deficient number, since it is larger than the sum of its proper divisors (2330379).

4164021 is a wasteful number, since it uses less digits than its factorization.

4164021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8145 (or 8139 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4164021 is about 2040.5932960784. The cubic root of 4164021 is about 160.8808320488.

Adding to 4164021 its reverse (1204614), we get a palindrome (5368635).

It can be divided in two parts, 4 and 164021, that added together give a square (164025 = 405²).

The spelling of 4164021 in words is "four million, one hundred sixty-four thousand, twenty-one".