420100321 has 4 divisors (see below), whose sum is σ = 420301252. Its totient is φ = 419899392.

The previous prime is 420100319. The next prime is 420100337. The reversal of 420100321 is 123001024.

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 177955600 + 242144721 = 13340^2 + 15561^2 .

It is a cyclic number.

It is not a de Polignac number, because 420100321 - 2¹ = 420100319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420100301) 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, 97296 + ... + 101521.

It is an arithmetic number, because the mean of its divisors is an integer number (105075313).

Almost surely, 2^420100321 is an apocalyptic number.

It is an amenable number.

420100321 is a deficient number, since it is larger than the sum of its proper divisors (200931).

420100321 is a wasteful number, since it uses less digits than its factorization.

420100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200930.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 420100321 is about 20496.3489675601. The cubic root of 420100321 is about 748.9468602581.

Adding to 420100321 its reverse (123001024), we get a palindrome (543101345).

It can be divided in two parts, 4201003 and 21, that added together give a palindrome (4201024).

The spelling of 420100321 in words is "four hundred twenty million, one hundred thousand, three hundred twenty-one".