420043321 has 4 divisors (see below), whose sum is σ = 420416500. Its totient is φ = 419670144.

The previous prime is 420043291. The next prime is 420043331. The reversal of 420043321 is 123340024.

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 230705721 + 189337600 = 15189^2 + 13760^2 .

It is a cyclic number.

It is not a de Polignac number, because 420043321 - 2¹³ = 420035129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420043331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184896 + ... + 187153.

It is an arithmetic number, because the mean of its divisors is an integer number (105104125).

Almost surely, 2^420043321 is an apocalyptic number.

It is an amenable number.

420043321 is a deficient number, since it is larger than the sum of its proper divisors (373179).

420043321 is a wasteful number, since it uses less digits than its factorization.

420043321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373178.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 420043321 is about 20494.9584288429. The cubic root of 420043321 is about 748.9129858875.

Adding to 420043321 its reverse (123340024), we get a palindrome (543383345).

The spelling of 420043321 in words is "four hundred twenty million, forty-three thousand, three hundred twenty-one".