4230021 has 4 divisors (see below), whose sum is σ = 5640032. Its totient is φ = 2820012.

The previous prime is 4230007. The next prime is 4230071. The reversal of 4230021 is 1200324.

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 4230021 - 2¹¹ = 4227973 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4229979 and 4230006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4230071) 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, 705001 + ... + 705006.

It is an arithmetic number, because the mean of its divisors is an integer number (1410008).

Almost surely, 2^4230021 is an apocalyptic number.

It is an amenable number.

4230021 is a deficient number, since it is larger than the sum of its proper divisors (1410011).

4230021 is a wasteful number, since it uses less digits than its factorization.

4230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410010.

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

The square root of 4230021 is about 2056.7014853887. The cubic root of 4230021 is about 161.7263708817.

Adding to 4230021 its reverse (1200324), we get a palindrome (5430345).

The spelling of 4230021 in words is "four million, two hundred thirty thousand, twenty-one".