421521432 has 64 divisors (see below), whose sum is σ = 1083456000. Its totient is φ = 136585344.

The previous prime is 421521431. The next prime is 421521439. The reversal of 421521432 is 234125124.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421521431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245794 + ... + 247502.

It is an arithmetic number, because the mean of its divisors is an integer number (16929000).

Almost surely, 2^421521432 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 421521432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (541728000).

421521432 is an abundant number, since it is smaller than the sum of its proper divisors (661934568).

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

421521432 is a wasteful number, since it uses less digits than its factorization.

421521432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000 (or 1996 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 421521432 is about 20530.9871170385. The cubic root of 421521432 is about 749.7904196625.

Adding to 421521432 its reverse (234125124), we get a palindrome (655646556).

The spelling of 421521432 in words is "four hundred twenty-one million, five hundred twenty-one thousand, four hundred thirty-two".