4158021 has 16 divisors (see below), whose sum is σ = 6364800. Its totient is φ = 2365248.

The previous prime is 4158019. The next prime is 4158031. The reversal of 4158021 is 1208514.

It is not a de Polignac number, because 4158021 - 2¹ = 4158019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

4158021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4158001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7915 + ... + 8423.

It is an arithmetic number, because the mean of its divisors is an integer number (397800).

Almost surely, 2^4158021 is an apocalyptic number.

It is an amenable number.

4158021 is a deficient number, since it is larger than the sum of its proper divisors (2206779).

4158021 is a wasteful number, since it uses less digits than its factorization.

4158021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 4158021 is about 2039.1226054360. The cubic root of 4158021 is about 160.8035230411.

The spelling of 4158021 in words is "four million, one hundred fifty-eight thousand, twenty-one".