448421021 has 4 divisors (see below), whose sum is σ = 450396672. Its totient is φ = 446445372.

The previous prime is 448420967. The next prime is 448421023. The reversal of 448421021 is 120124844.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-448421021 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 (448421023) 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, 987485 + ... + 987938.

It is an arithmetic number, because the mean of its divisors is an integer number (112599168).

Almost surely, 2^448421021 is an apocalyptic number.

It is an amenable number.

448421021 is a deficient number, since it is larger than the sum of its proper divisors (1975651).

448421021 is a wasteful number, since it uses less digits than its factorization.

448421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975650.

The product of its (nonzero) digits is 2048, while the sum is 26.

The square root of 448421021 is about 21175.9538392017. The cubic root of 448421021 is about 765.4120957389.

Adding to 448421021 its reverse (120124844), we get a palindrome (568545865).

The spelling of 448421021 in words is "four hundred forty-eight million, four hundred twenty-one thousand, twenty-one".