448800021 has 10 divisors (see below), whose sum is σ = 670429782. Its totient is φ = 299199960.

The previous prime is 448800013. The next prime is 448800029. The reversal of 448800021 is 120008844.

It is an interprime number because it is at equal distance from previous prime (448800013) and next prime (448800029).

It can be written as a sum of positive squares in only one way, i.e., 255200625 + 193599396 = 15975^2 + 13914^2 .

It is not a de Polignac number, because 448800021 - 2³ = 448800013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (448800029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2770290 + ... + 2770451.

Almost surely, 2^448800021 is an apocalyptic number.

It is an amenable number.

448800021 is a deficient number, since it is larger than the sum of its proper divisors (221629761).

448800021 is an equidigital number, since it uses as much as digits as its factorization.

448800021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5540753 (or 5540744 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 448800021 is about 21184.9007786206. The cubic root of 448800021 is about 765.6276740176.

Adding to 448800021 its reverse (120008844), we get a palindrome (568808865).

The spelling of 448800021 in words is "four hundred forty-eight million, eight hundred thousand, twenty-one".