21243324467 has 4 divisors (see below), whose sum is σ = 21271611936. Its totient is φ = 21215037000.

The previous prime is 21243324449. The next prime is 21243324497. The reversal of 21243324467 is 76442334212.

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

It is a cyclic number.

It is not a de Polignac number, because 21243324467 - 2⁸ = 21243324211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21243324467.

It is not an unprimeable number, because it can be changed into a prime (21243324497) 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 3 ways as a sum of consecutive naturals, for example, 14142608 + ... + 14144109.

It is an arithmetic number, because the mean of its divisors is an integer number (5317902984).

Almost surely, 2^21243324467 is an apocalyptic number.

21243324467 is a deficient number, since it is larger than the sum of its proper divisors (28287469).

21243324467 is an equidigital number, since it uses as much as digits as its factorization.

21243324467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28287468.

The product of its digits is 193536, while the sum is 38.

Adding to 21243324467 its reverse (76442334212), we get a palindrome (97685658679).

The spelling of 21243324467 in words is "twenty-one billion, two hundred forty-three million, three hundred twenty-four thousand, four hundred sixty-seven".