421404321 has 16 divisors (see below), whose sum is σ = 631403136. Its totient is φ = 248050176.

The previous prime is 421404311. The next prime is 421404323. The reversal of 421404321 is 123404124.

It is not a de Polignac number, because 421404321 - 2⁵ = 421404289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421404323) 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, 234000 + ... + 235793.

It is an arithmetic number, because the mean of its divisors is an integer number (39462696).

Almost surely, 2^421404321 is an apocalyptic number.

It is an amenable number.

421404321 is a deficient number, since it is larger than the sum of its proper divisors (209998815).

421404321 is a wasteful number, since it uses less digits than its factorization.

421404321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469832.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 421404321 is about 20528.1348641322. The cubic root of 421404321 is about 749.7209753176.

Adding to 421404321 its reverse (123404124), we get a palindrome (544808445).

The spelling of 421404321 in words is "four hundred twenty-one million, four hundred four thousand, three hundred twenty-one".