21324444123 has 4 divisors (see below), whose sum is σ = 28432592168. Its totient is φ = 14216296080.

The previous prime is 21324444103. The next prime is 21324444131. The reversal of 21324444123 is 32144442312.

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

It is not a de Polignac number, because 21324444123 - 2⁹ = 21324443611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324444103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3554074018 + ... + 3554074023.

It is an arithmetic number, because the mean of its divisors is an integer number (7108148042).

Almost surely, 2^21324444123 is an apocalyptic number.

21324444123 is a deficient number, since it is larger than the sum of its proper divisors (7108148045).

21324444123 is an equidigital number, since it uses as much as digits as its factorization.

21324444123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7108148044.

The product of its digits is 18432, while the sum is 30.

Adding to 21324444123 its reverse (32144442312), we get a palindrome (53468886435).

The spelling of 21324444123 in words is "twenty-one billion, three hundred twenty-four million, four hundred forty-four thousand, one hundred twenty-three".