423678221 has 4 divisors (see below), whose sum is σ = 423720444. Its totient is φ = 423636000.

The previous prime is 423678217. The next prime is 423678251. The reversal of 423678221 is 122876324.

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 80910025 + 342768196 = 8995^2 + 18514^2 .

It is a cyclic number.

It is not a de Polignac number, because 423678221 - 2² = 423678217 is a prime.

It is a super-3 number, since 3×423678221³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423678251) 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, 3521 + ... + 29321.

It is an arithmetic number, because the mean of its divisors is an integer number (105930111).

Almost surely, 2^423678221 is an apocalyptic number.

It is an amenable number.

423678221 is a deficient number, since it is larger than the sum of its proper divisors (42223).

423678221 is a wasteful number, since it uses less digits than its factorization.

423678221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42222.

The product of its digits is 32256, while the sum is 35.

The square root of 423678221 is about 20583.4453141353. The cubic root of 423678221 is about 751.0670565412.

The spelling of 423678221 in words is "four hundred twenty-three million, six hundred seventy-eight thousand, two hundred twenty-one".