4457021 has 4 divisors (see below), whose sum is σ = 4489692. Its totient is φ = 4424352.

The previous prime is 4456997. The next prime is 4457093. The reversal of 4457021 is 1207544.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1932100 + 2524921 = 1390^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 4457021 - 2⁶ = 4456957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4457221) 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, 16130 + ... + 16403.

It is an arithmetic number, because the mean of its divisors is an integer number (1122423).

Almost surely, 2^4457021 is an apocalyptic number.

It is an amenable number.

4457021 is a deficient number, since it is larger than the sum of its proper divisors (32671).

4457021 is a wasteful number, since it uses less digits than its factorization.

4457021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32670.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 4457021 is about 2111.1657916895. The cubic root of 4457021 is about 164.5690745040.

The spelling of 4457021 in words is "four million, four hundred fifty-seven thousand, twenty-one".