21423124443 has 32 divisors (see below), whose sum is σ = 32991598080. Its totient is φ = 12111897600.

The previous prime is 21423124433. The next prime is 21423124483. The reversal of 21423124443 is 34442132412.

It is not a de Polignac number, because 21423124443 - 2²⁶ = 21356015579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21423124443.

It is not an unprimeable number, because it can be changed into a prime (21423124403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4003896 + ... + 4009242.

It is an arithmetic number, because the mean of its divisors is an integer number (1030987440).

Almost surely, 2^21423124443 is an apocalyptic number.

21423124443 is a deficient number, since it is larger than the sum of its proper divisors (11568473637).

21423124443 is a wasteful number, since it uses less digits than its factorization.

21423124443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7347.

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

Adding to 21423124443 its reverse (34442132412), we get a palindrome (55865256855).

The spelling of 21423124443 in words is "twenty-one billion, four hundred twenty-three million, one hundred twenty-four thousand, four hundred forty-three".