4023021 has 4 divisors (see below), whose sum is σ = 5364032. Its totient is φ = 2682012.

The previous prime is 4023017. The next prime is 4023023. The reversal of 4023021 is 1203204.

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 not a de Polignac number, because 4023021 - 2² = 4023017 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

4023021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4022988 and 4023006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4023023) 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, 670501 + ... + 670506.

It is an arithmetic number, because the mean of its divisors is an integer number (1341008).

Almost surely, 2^4023021 is an apocalyptic number.

It is an amenable number.

4023021 is a deficient number, since it is larger than the sum of its proper divisors (1341011).

4023021 is a wasteful number, since it uses less digits than its factorization.

4023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341010.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 4023021 is about 2005.7469930178. The cubic root of 4023021 is about 159.0440525063.

Adding to 4023021 its reverse (1203204), we get a palindrome (5226225).

The spelling of 4023021 in words is "four million, twenty-three thousand, twenty-one".