221242423 has 8 divisors (see below), whose sum is σ = 226107200. Its totient is φ = 216429408.

The previous prime is 221242409. The next prime is 221242433. The reversal of 221242423 is 324242122.

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 221242423 - 2¹³ = 221234231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221242394 and 221242403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221242433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4236 + ... + 21457.

It is an arithmetic number, because the mean of its divisors is an integer number (28263400).

Almost surely, 2^221242423 is an apocalyptic number.

221242423 is a deficient number, since it is larger than the sum of its proper divisors (4864777).

221242423 is a wasteful number, since it uses less digits than its factorization.

221242423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25881.

The product of its digits is 1536, while the sum is 22.

The square root of 221242423 is about 14874.2200803941. The cubic root of 221242423 is about 604.8153460557.

Adding to 221242423 its reverse (324242122), we get a palindrome (545484545).

The spelling of 221242423 in words is "two hundred twenty-one million, two hundred forty-two thousand, four hundred twenty-three".