21224234423 has 16 divisors (see below), whose sum is σ = 25543119360. Its totient is φ = 17241577056.

The previous prime is 21224234407. The next prime is 21224234431. The reversal of 21224234423 is 32443242212.

It is a cyclic number.

It is not a de Polignac number, because 21224234423 - 2⁴ = 21224234407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224234123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 587165 + ... + 622262.

It is an arithmetic number, because the mean of its divisors is an integer number (1596444960).

Almost surely, 2^21224234423 is an apocalyptic number.

21224234423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21224234423 is a deficient number, since it is larger than the sum of its proper divisors (4318884937).

21224234423 is a wasteful number, since it uses less digits than its factorization.

21224234423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209566.

The product of its digits is 18432, while the sum is 29.

Adding to 21224234423 its reverse (32443242212), we get a palindrome (53667476635).

The spelling of 21224234423 in words is "twenty-one billion, two hundred twenty-four million, two hundred thirty-four thousand, four hundred twenty-three".