421221232432 has 240 divisors, whose sum is σ = 1109902390272. Its totient is φ = 150372218880.

The previous prime is 421221232429. The next prime is 421221232433. The reversal of 421221232432 is 234232122124.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 421221232432.

It is not an unprimeable number, because it can be changed into a prime (421221232433) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28517113 + ... + 28531879.

Almost surely, 2^421221232432 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 421221232432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (554951195136).

421221232432 is an abundant number, since it is smaller than the sum of its proper divisors (688681157840).

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

421221232432 is a wasteful number, since it uses less digits than its factorization.

421221232432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14956 (or 14937 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

Adding to 421221232432 its reverse (234232122124), we get a palindrome (655453354556).

The spelling of 421221232432 in words is "four hundred twenty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, four hundred thirty-two".