421444020 has 96 divisors (see below), whose sum is σ = 1199068416. Its totient is φ = 110592000.

The previous prime is 421443941. The next prime is 421444033. The reversal of 421444020 is 20444124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1639732 + ... + 1639988.

It is an arithmetic number, because the mean of its divisors is an integer number (12490296).

Almost surely, 2^421444020 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 421444020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (599534208).

421444020 is an abundant number, since it is smaller than the sum of its proper divisors (777624396).

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

421444020 is a wasteful number, since it uses less digits than its factorization.

421444020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 421444020 is about 20529.1017825915. The cubic root of 421444020 is about 749.7445174259.

Adding to 421444020 its reverse (20444124), we get a palindrome (441888144).

It can be divided in two parts, 42144 and 4020, that added together give a palindrome (46164).

The spelling of 421444020 in words is "four hundred twenty-one million, four hundred forty-four thousand, twenty".