4043021 has 4 divisors (see below), whose sum is σ = 4056252. Its totient is φ = 4029792.

The previous prime is 4042993. The next prime is 4043023. The reversal of 4043021 is 1203404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 784996 + 3258025 = 886^2 + 1805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4043021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4042987 and 4043005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4043023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6146 + ... + 6771.

It is an arithmetic number, because the mean of its divisors is an integer number (1014063).

Almost surely, 2^4043021 is an apocalyptic number.

It is an amenable number.

4043021 is a deficient number, since it is larger than the sum of its proper divisors (13231).

4043021 is a wasteful number, since it uses less digits than its factorization.

4043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13230.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 4043021 is about 2010.7264856265. The cubic root of 4043021 is about 159.3071735480.

Adding to 4043021 its reverse (1203404), we get a palindrome (5246425).

The spelling of 4043021 in words is "four million, forty-three thousand, twenty-one".