420500321 has 4 divisors (see below), whose sum is σ = 445235652. Its totient is φ = 395764992.

The previous prime is 420500317. The next prime is 420500323. The reversal of 420500321 is 123005024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 385690321 + 34810000 = 19639^2 + 5900^2 .

It is a cyclic number.

It is not a de Polignac number, because 420500321 - 2² = 420500317 is a prime.

It is a super-2 number, since 2×420500321² = 353641039922206082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 24735313 = 420500321 / (4 + 2 + 0 + 5 + 0 + 0 + 3 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420500321.

It is not an unprimeable number, because it can be changed into a prime (420500323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12367640 + ... + 12367673.

It is an arithmetic number, because the mean of its divisors is an integer number (111308913).

Almost surely, 2^420500321 is an apocalyptic number.

It is an amenable number.

420500321 is a deficient number, since it is larger than the sum of its proper divisors (24735331).

420500321 is a wasteful number, since it uses less digits than its factorization.

420500321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24735330.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 420500321 is about 20506.1044813490. The cubic root of 420500321 is about 749.1844889845.

Adding to 420500321 its reverse (123005024), we get a palindrome (543505345).

It can be divided in two parts, 4205003 and 21, that added together give a palindrome (4205024).

The spelling of 420500321 in words is "four hundred twenty million, five hundred thousand, three hundred twenty-one".