441220021 has 8 divisors (see below), whose sum is σ = 482789088. Its totient is φ = 399894000.

The previous prime is 441220001. The next prime is 441220027. The reversal of 441220021 is 120022144.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 441220021 - 2⁹ = 441219509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 441219977 and 441220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (441220027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56950 + ... + 64231.

It is an arithmetic number, because the mean of its divisors is an integer number (60348636).

Almost surely, 2^441220021 is an apocalyptic number.

It is an amenable number.

441220021 is a deficient number, since it is larger than the sum of its proper divisors (41569067).

441220021 is a wasteful number, since it uses less digits than its factorization.

441220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121523.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 441220021 is about 21005.2379419991. The cubic root of 441220021 is about 761.2928255149.

Adding to 441220021 its reverse (120022144), we get a palindrome (561242165).

The spelling of 441220021 in words is "four hundred forty-one million, two hundred twenty thousand, twenty-one".