421632420 has 96 divisors (see below), whose sum is σ = 1355719680. Its totient is φ = 96831360.

The previous prime is 421632403. The next prime is 421632443. The reversal of 421632420 is 24236124.

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, 4272 + ... + 29351.

It is an arithmetic number, because the mean of its divisors is an integer number (14122080).

Almost surely, 2^421632420 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 421632420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (677859840).

421632420 is an abundant number, since it is smaller than the sum of its proper divisors (934087260).

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

421632420 is a wasteful number, since it uses less digits than its factorization.

421632420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33665 (or 33663 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 421632420 is about 20533.6898778568. The cubic root of 421632420 is about 749.8562213276.

Adding to 421632420 its reverse (24236124), we get a palindrome (445868544).

The spelling of 421632420 in words is "four hundred twenty-one million, six hundred thirty-two thousand, four hundred twenty".