4003021 has 4 divisors (see below), whose sum is σ = 4366944. Its totient is φ = 3639100.

The previous prime is 4003019. The next prime is 4003033. The reversal of 4003021 is 1203004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4003021 - 2¹ = 4003019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4002989 and 4003007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4003001) 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, 181945 + ... + 181966.

It is an arithmetic number, because the mean of its divisors is an integer number (1091736).

Almost surely, 2^4003021 is an apocalyptic number.

It is an amenable number.

4003021 is a deficient number, since it is larger than the sum of its proper divisors (363923).

4003021 is a wasteful number, since it uses less digits than its factorization.

4003021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363922.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 4003021 is about 2000.7551074532. The cubic root of 4003021 is about 158.7800579619.

Adding to 4003021 its reverse (1203004), we get a palindrome (5206025).

The spelling of 4003021 in words is "four million, three thousand, twenty-one".