4572021 has 4 divisors (see below), whose sum is σ = 6096032. Its totient is φ = 3048012.

The previous prime is 4572017. The next prime is 4572023. The reversal of 4572021 is 1202754.

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 4572021 - 2² = 4572017 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

4572021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4572023) 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, 762001 + ... + 762006.

It is an arithmetic number, because the mean of its divisors is an integer number (1524008).

Almost surely, 2^4572021 is an apocalyptic number.

It is an amenable number.

4572021 is a deficient number, since it is larger than the sum of its proper divisors (1524011).

4572021 is a wasteful number, since it uses less digits than its factorization.

4572021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524010.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 4572021 is about 2138.2284723574. The cubic root of 4572021 is about 165.9724757191.

Adding to 4572021 its reverse (1202754), we get a palindrome (5774775).

The spelling of 4572021 in words is "four million, five hundred seventy-two thousand, twenty-one".