421024321 has 4 divisors (see below), whose sum is σ = 421071444. Its totient is φ = 420977200.

The previous prime is 421024301. The next prime is 421024333. The reversal of 421024321 is 123420124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 314707600 + 106316721 = 17740^2 + 10311^2 .

It is a cyclic number.

It is not a de Polignac number, because 421024321 - 2¹³ = 421016129 is a prime.

It is a super-2 number, since 2×421024321² = 354522957747022082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421024301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5590 + ... + 29551.

It is an arithmetic number, because the mean of its divisors is an integer number (105267861).

Almost surely, 2^421024321 is an apocalyptic number.

It is an amenable number.

421024321 is a deficient number, since it is larger than the sum of its proper divisors (47123).

421024321 is a wasteful number, since it uses less digits than its factorization.

421024321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47122.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 421024321 is about 20518.8771866299. The cubic root of 421024321 is about 749.4955547153.

Adding to 421024321 its reverse (123420124), we get a palindrome (544444445).

The spelling of 421024321 in words is "four hundred twenty-one million, twenty-four thousand, three hundred twenty-one".