21233222123 has 6 divisors (see below), whose sum is σ = 21280819524. Its totient is φ = 21185730944.

The previous prime is 21233222089. The next prime is 21233222141. The reversal of 21233222123 is 32122233212.

It is a de Polignac number, because none of the positive numbers 2^k-21233222123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233222183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148940 + ... + 254262.

It is an arithmetic number, because the mean of its divisors is an integer number (3546803254).

Almost surely, 2^21233222123 is an apocalyptic number.

21233222123 is a deficient number, since it is larger than the sum of its proper divisors (47597401).

21233222123 is an frugal number, since it uses more digits than its factorization.

21233222123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106221 (or 105772 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

Adding to 21233222123 its reverse (32122233212), we get a palindrome (53355455335).

The spelling of 21233222123 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty-two thousand, one hundred twenty-three".