441432021 has 4 divisors (see below), whose sum is σ = 588576032. Its totient is φ = 294288012.

The previous prime is 441432011. The next prime is 441432049. The reversal of 441432021 is 120234144.

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 441432021 - 2²¹ = 439334869 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 (441432011) 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, 73572001 + ... + 73572006.

It is an arithmetic number, because the mean of its divisors is an integer number (147144008).

Almost surely, 2^441432021 is an apocalyptic number.

It is an amenable number.

441432021 is a deficient number, since it is larger than the sum of its proper divisors (147144011).

441432021 is a wasteful number, since it uses less digits than its factorization.

441432021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147144010.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 441432021 is about 21010.2836963236. The cubic root of 441432021 is about 761.4147361483.

Adding to 441432021 its reverse (120234144), we get a palindrome (561666165).

It can be divided in two parts, 44143 and 2021, that added together give a palindrome (46164).

The spelling of 441432021 in words is "four hundred forty-one million, four hundred thirty-two thousand, twenty-one".