441400021 has 4 divisors (see below), whose sum is σ = 441463500. Its totient is φ = 441336544.

The previous prime is 441400007. The next prime is 441400027. The reversal of 441400021 is 120004144.

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 73719396 + 367680625 = 8586^2 + 19175^2 .

It is a cyclic number.

It is not a de Polignac number, because 441400021 - 2²³ = 433011413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 441399968 and 441400004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (441400027) 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 3 ways as a sum of consecutive naturals, for example, 19816 + ... + 35713.

It is an arithmetic number, because the mean of its divisors is an integer number (110365875).

Almost surely, 2^441400021 is an apocalyptic number.

It is an amenable number.

441400021 is a deficient number, since it is larger than the sum of its proper divisors (63479).

441400021 is an equidigital number, since it uses as much as digits as its factorization.

441400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63478.

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

The square root of 441400021 is about 21009.5221506821. The cubic root of 441400021 is about 761.3963370448.

Adding to 441400021 its reverse (120004144), we get a palindrome (561404165).

The spelling of 441400021 in words is "four hundred forty-one million, four hundred thousand, twenty-one".