420324221 has 8 divisors (see below), whose sum is σ = 427540344. Its totient is φ = 413118720.

The previous prime is 420324217. The next prime is 420324227. The reversal of 420324221 is 122423024.

It can be written as a sum of positive squares in 4 ways, for example, as 20124196 + 400200025 = 4486^2 + 20005^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 420324221 - 2² = 420324217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 420324193 and 420324202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420324227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158321 + ... + 160953.

It is an arithmetic number, because the mean of its divisors is an integer number (53442543).

Almost surely, 2^420324221 is an apocalyptic number.

It is an amenable number.

420324221 is a deficient number, since it is larger than the sum of its proper divisors (7216123).

420324221 is a wasteful number, since it uses less digits than its factorization.

420324221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5311.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 420324221 is about 20501.8101883712. The cubic root of 420324221 is about 749.0798915140.

Adding to 420324221 its reverse (122423024), we get a palindrome (542747245).

The spelling of 420324221 in words is "four hundred twenty million, three hundred twenty-four thousand, two hundred twenty-one".