420445321 has 4 divisors (see below), whose sum is σ = 420486352. Its totient is φ = 420404292.

The previous prime is 420445307. The next prime is 420445351. The reversal of 420445321 is 123544024.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 420445321 - 2⁹ = 420444809 is a prime.

It is a super-3 number, since 3×420445321³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420445351) 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, 9286 + ... + 30448.

It is an arithmetic number, because the mean of its divisors is an integer number (105121588).

Almost surely, 2^420445321 is an apocalyptic number.

It is an amenable number.

420445321 is a deficient number, since it is larger than the sum of its proper divisors (41031).

420445321 is a wasteful number, since it uses less digits than its factorization.

420445321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41030.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 420445321 is about 20504.7633734213. The cubic root of 420445321 is about 749.1518239730.

Adding to 420445321 its reverse (123544024), we get a palindrome (543989345).

The spelling of 420445321 in words is "four hundred twenty million, four hundred forty-five thousand, three hundred twenty-one".