21443334123 has 8 divisors (see below), whose sum is σ = 28601456128. Its totient is φ = 14290384104.

The previous prime is 21443334113. The next prime is 21443334163. The reversal of 21443334123 is 32143334412.

It is a happy number.

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

It is not a de Polignac number, because 21443334123 - 2⁵ = 21443334091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443334113) 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, 1283311 + ... + 1299912.

It is an arithmetic number, because the mean of its divisors is an integer number (3575182016).

Almost surely, 2^21443334123 is an apocalyptic number.

21443334123 is a deficient number, since it is larger than the sum of its proper divisors (7158122005).

21443334123 is a wasteful number, since it uses less digits than its factorization.

21443334123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585993.

The product of its digits is 20736, while the sum is 30.

Adding to 21443334123 its reverse (32143334412), we get a palindrome (53586668535).

The spelling of 21443334123 in words is "twenty-one billion, four hundred forty-three million, three hundred thirty-four thousand, one hundred twenty-three".