421432220 has 96 divisors (see below), whose sum is σ = 1035127296. Its totient is φ = 142560000.

The previous prime is 421432213. The next prime is 421432223. The reversal of 421432220 is 22234124.

421432220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 421432192 and 421432201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421432223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186095 + ... + 188345.

It is an arithmetic number, because the mean of its divisors is an integer number (10782576).

Almost surely, 2^421432220 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 421432220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (517563648).

421432220 is an abundant number, since it is smaller than the sum of its proper divisors (613695076).

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

421432220 is a wasteful number, since it uses less digits than its factorization.

421432220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421432220 is about 20528.8143836901. The cubic root of 421432220 is about 749.7375200016.

Adding to 421432220 its reverse (22234124), we get a palindrome (443666344).

The spelling of 421432220 in words is "four hundred twenty-one million, four hundred thirty-two thousand, two hundred twenty".