423041021 has 4 divisors (see below), whose sum is σ = 455582652. Its totient is φ = 390499392.

The previous prime is 423041011. The next prime is 423041029. The reversal of 423041021 is 120140324.

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 171976996 + 251064025 = 13114^2 + 15845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423041021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423041029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16270796 + ... + 16270821.

It is an arithmetic number, because the mean of its divisors is an integer number (113895663).

Almost surely, 2^423041021 is an apocalyptic number.

It is an amenable number.

423041021 is a deficient number, since it is larger than the sum of its proper divisors (32541631).

423041021 is a wasteful number, since it uses less digits than its factorization.

423041021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32541630.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 423041021 is about 20567.9610316628. The cubic root of 423041021 is about 750.6903397871.

Adding to 423041021 its reverse (120140324), we get a palindrome (543181345).

The spelling of 423041021 in words is "four hundred twenty-three million, forty-one thousand, twenty-one".