221433123 has 16 divisors (see below), whose sum is σ = 303654656. Its totient is φ = 143428320.

The previous prime is 221433119. The next prime is 221433137. The reversal of 221433123 is 321334122.

221433123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221433123 - 2² = 221433119 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 221433123.

It is not an unprimeable number, because it can be changed into a prime (221433103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143868 + ... + 145398.

It is an arithmetic number, because the mean of its divisors is an integer number (18978416).

Almost surely, 2^221433123 is an apocalyptic number.

221433123 is a deficient number, since it is larger than the sum of its proper divisors (82221533).

221433123 is a wasteful number, since it uses less digits than its factorization.

221433123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874.

The product of its digits is 864, while the sum is 21.

The square root of 221433123 is about 14880.6291197651. The cubic root of 221433123 is about 604.9890697659.

Adding to 221433123 its reverse (321334122), we get a palindrome (542767245).

Subtracting 221433123 from its reverse (321334122), we obtain a palindrome (99900999).

The spelling of 221433123 in words is "two hundred twenty-one million, four hundred thirty-three thousand, one hundred twenty-three".