221321423 has 8 divisors (see below), whose sum is σ = 225276480. Its totient is φ = 217395360.

The previous prime is 221321381. The next prime is 221321459. The reversal of 221321423 is 324123122.

221321423 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221321423 - 2¹⁶ = 221255887 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221321395 and 221321404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221321483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8453 + ... + 22673.

It is an arithmetic number, because the mean of its divisors is an integer number (28159560).

Almost surely, 2^221321423 is an apocalyptic number.

221321423 is a deficient number, since it is larger than the sum of its proper divisors (3955057).

221321423 is a wasteful number, since it uses less digits than its factorization.

221321423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14497.

The product of its digits is 576, while the sum is 20.

The square root of 221321423 is about 14876.8754447969. The cubic root of 221321423 is about 604.8873255097.

Adding to 221321423 its reverse (324123122), we get a palindrome (545444545).

The spelling of 221321423 in words is "two hundred twenty-one million, three hundred twenty-one thousand, four hundred twenty-three".