4026021 has 4 divisors (see below), whose sum is σ = 5368032. Its totient is φ = 2684012.

The previous prime is 4026017. The next prime is 4026031. The reversal of 4026021 is 1206204.

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 4026021 - 2² = 4026017 is a prime.

It is an Ulam number.

It is a D-number.

It is a Curzon number.

4026021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4026031) 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, 671001 + ... + 671006.

It is an arithmetic number, because the mean of its divisors is an integer number (1342008).

Almost surely, 2^4026021 is an apocalyptic number.

It is an amenable number.

4026021 is a deficient number, since it is larger than the sum of its proper divisors (1342011).

4026021 is a wasteful number, since it uses less digits than its factorization.

4026021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342010.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 4026021 is about 2006.4947047027. The cubic root of 4026021 is about 159.0835761716.

The spelling of 4026021 in words is "four million, twenty-six thousand, twenty-one".