4238021 has 4 divisors (see below), whose sum is σ = 4243200. Its totient is φ = 4232844.

The previous prime is 4238011. The next prime is 4238033. The reversal of 4238021 is 1208324.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4238021 - 2¹⁰ = 4236997 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4237984 and 4238002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4238011) 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, 1061 + ... + 3098.

It is an arithmetic number, because the mean of its divisors is an integer number (1060800).

Almost surely, 2^4238021 is an apocalyptic number.

It is an amenable number.

4238021 is a deficient number, since it is larger than the sum of its proper divisors (5179).

4238021 is a wasteful number, since it uses less digits than its factorization.

4238021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5178.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 4238021 is about 2058.6454284310. The cubic root of 4238021 is about 161.8282613283.

The spelling of 4238021 in words is "four million, two hundred thirty-eight thousand, twenty-one".