421320444 has 24 divisors (see below), whose sum is σ = 989116800. Its totient is φ = 139577904.

The previous prime is 421320437. The next prime is 421320451. The reversal of 421320444 is 444023124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (421320437) and next prime (421320451).

It is a congruent number.

It is an unprimeable number.

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, 105744 + ... + 109655.

It is an arithmetic number, because the mean of its divisors is an integer number (41213200).

Almost surely, 2^421320444 is an apocalyptic number.

It is an amenable number.

421320444 is an abundant number, since it is smaller than the sum of its proper divisors (567796356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421320444 is a wasteful number, since it uses less digits than its factorization.

421320444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215569 (or 215567 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 421320444 is about 20526.0917858223. The cubic root of 421320444 is about 749.6712301238.

Adding to 421320444 its reverse (444023124), we get a palindrome (865343568).

The spelling of 421320444 in words is "four hundred twenty-one million, three hundred twenty thousand, four hundred forty-four".