4309021 has 4 divisors (see below), whose sum is σ = 4313632. Its totient is φ = 4304412.

The previous prime is 4309013. The next prime is 4309033. The reversal of 4309021 is 1209034.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1209034 = 2 ⋅604517.

It is a cyclic number.

It is not a de Polignac number, because 4309021 - 2³ = 4309013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4309021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4309001) 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, 351 + ... + 2956.

It is an arithmetic number, because the mean of its divisors is an integer number (1078408).

Almost surely, 2^4309021 is an apocalyptic number.

It is an amenable number.

4309021 is a deficient number, since it is larger than the sum of its proper divisors (4611).

4309021 is a wasteful number, since it uses less digits than its factorization.

4309021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4610.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 4309021 is about 2075.8181519584. The cubic root of 4309021 is about 162.7269696207.

The spelling of 4309021 in words is "four million, three hundred nine thousand, twenty-one".