21243424223 has 8 divisors (see below), whose sum is σ = 24279444000. Its totient is φ = 18207715680.

The previous prime is 21243424187. The next prime is 21243424231. The reversal of 21243424223 is 32242434212.

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

It is not a de Polignac number, because 21243424223 - 2¹⁶ = 21243358687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243424253) 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, 93653 + ... + 226401.

It is an arithmetic number, because the mean of its divisors is an integer number (3034930500).

Almost surely, 2^21243424223 is an apocalyptic number.

21243424223 is a deficient number, since it is larger than the sum of its proper divisors (3036019777).

21243424223 is a wasteful number, since it uses less digits than its factorization.

21243424223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155617.

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

Adding to 21243424223 its reverse (32242434212), we get a palindrome (53485858435).

The spelling of 21243424223 in words is "twenty-one billion, two hundred forty-three million, four hundred twenty-four thousand, two hundred twenty-three".