421005344 has 48 divisors (see below), whose sum is σ = 874591200. Its totient is φ = 198941184.

The previous prime is 421005337. The next prime is 421005359. The reversal of 421005344 is 443500124.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448844 + ... + 449780.

It is an arithmetic number, because the mean of its divisors is an integer number (18220650).

Almost surely, 2^421005344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421005344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (437295600).

421005344 is an abundant number, since it is smaller than the sum of its proper divisors (453585856).

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

421005344 is a wasteful number, since it uses less digits than its factorization.

421005344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 421005344 is about 20518.4147535817. The cubic root of 421005344 is about 749.4842937737.

Adding to 421005344 its reverse (443500124), we get a palindrome (864505468).

The spelling of 421005344 in words is "four hundred twenty-one million, five thousand, three hundred forty-four".