21224340323 has 4 divisors (see below), whose sum is σ = 21675922080. Its totient is φ = 20772758568.

The previous prime is 21224340311. The next prime is 21224340331. The reversal of 21224340323 is 32304342212.

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 21224340323 - 2⁴ = 21224340307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21224340292 and 21224340301.

It is not an unprimeable number, because it can be changed into a prime (21224342323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225790808 + ... + 225790901.

It is an arithmetic number, because the mean of its divisors is an integer number (5418980520).

Almost surely, 2^21224340323 is an apocalyptic number.

21224340323 is a deficient number, since it is larger than the sum of its proper divisors (451581757).

21224340323 is an equidigital number, since it uses as much as digits as its factorization.

21224340323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451581756.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21224340323 its reverse (32304342212), we get a palindrome (53528682535).

The spelling of 21224340323 in words is "twenty-one billion, two hundred twenty-four million, three hundred forty thousand, three hundred twenty-three".