221024423 has 4 divisors (see below), whose sum is σ = 223052280. Its totient is φ = 218996568.

The previous prime is 221024413. The next prime is 221024431. The reversal of 221024423 is 324420122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221024423 - 2¹⁸ = 220762279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221024395 and 221024404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221024413) 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, 1013765 + ... + 1013982.

It is an arithmetic number, because the mean of its divisors is an integer number (55763070).

Almost surely, 2^221024423 is an apocalyptic number.

221024423 is a deficient number, since it is larger than the sum of its proper divisors (2027857).

221024423 is a wasteful number, since it uses less digits than its factorization.

221024423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027856.

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

The square root of 221024423 is about 14866.8901590077. The cubic root of 221024423 is about 604.6166302862.

Adding to 221024423 its reverse (324420122), we get a palindrome (545444545).

The spelling of 221024423 in words is "two hundred twenty-one million, twenty-four thousand, four hundred twenty-three".