421421800 has 24 divisors (see below), whose sum is σ = 979806150. Its totient is φ = 168568640.

The previous prime is 421421783. The next prime is 421421807. The reversal of 421421800 is 8124124.

It can be written as a sum of positive squares in 3 ways, for example, as 268107876 + 153313924 = 16374^2 + 12382^2 .

It is not an unprimeable number, because it can be changed into a prime (421421807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1053355 + ... + 1053754.

Almost surely, 2^421421800 is an apocalyptic number.

421421800 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

421421800 is an abundant number, since it is smaller than the sum of its proper divisors (558384350).

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

421421800 is a wasteful number, since it uses less digits than its factorization.

421421800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107125 (or 2107116 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 421421800 is about 20528.5605925014. The cubic root of 421421800 is about 749.7313408115.

Adding to 421421800 its reverse (8124124), we get a palindrome (429545924).

The spelling of 421421800 in words is "four hundred twenty-one million, four hundred twenty-one thousand, eight hundred".