423356221 has 4 divisors (see below), whose sum is σ = 423398844. Its totient is φ = 423313600.

The previous prime is 423356161. The next prime is 423356231. The reversal of 423356221 is 122653324.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 113103225 + 310252996 = 10635^2 + 17614^2 .

It is a cyclic number.

It is not a de Polignac number, because 423356221 - 2²³ = 414967613 is a prime.

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 423356221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423356231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2331 + ... + 29191.

It is an arithmetic number, because the mean of its divisors is an integer number (105849711).

Almost surely, 2^423356221 is an apocalyptic number.

It is an amenable number.

423356221 is a deficient number, since it is larger than the sum of its proper divisors (42623).

423356221 is a wasteful number, since it uses less digits than its factorization.

423356221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42622.

The product of its digits is 8640, while the sum is 28.

The square root of 423356221 is about 20575.6220076089. The cubic root of 423356221 is about 750.8767353068.

The spelling of 423356221 in words is "four hundred twenty-three million, three hundred fifty-six thousand, two hundred twenty-one".