21423303231 has 16 divisors (see below), whose sum is σ = 31921198848. Its totient is φ = 12667140800.

The previous prime is 21423303217. The next prime is 21423303271. The reversal of 21423303231 is 13230332412.

It is a cyclic number.

It is not a de Polignac number, because 21423303231 - 2⁵ = 21423303199 is a prime.

It is a super-2 number, since 2×21423303231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423303271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7915611 + ... + 7918316.

It is an arithmetic number, because the mean of its divisors is an integer number (1995074928).

Almost surely, 2^21423303231 is an apocalyptic number.

21423303231 is a deficient number, since it is larger than the sum of its proper divisors (10497895617).

21423303231 is a wasteful number, since it uses less digits than its factorization.

21423303231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15833982.

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21423303231 its reverse (13230332412), we get a palindrome (34653635643).

The spelling of 21423303231 in words is "twenty-one billion, four hundred twenty-three million, three hundred three thousand, two hundred thirty-one".