21304424275 has 6 divisors (see below), whose sum is σ = 26417486132. Its totient is φ = 17043539400.

The previous prime is 21304424243. The next prime is 21304424279. The reversal of 21304424275 is 57242440312.

It is not a de Polignac number, because 21304424275 - 2⁵ = 21304424243 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 21304424275.

It is not an unprimeable number, because it can be changed into a prime (21304424279) 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 5 ways as a sum of consecutive naturals, for example, 426088461 + ... + 426088510.

Almost surely, 2^21304424275 is an apocalyptic number.

21304424275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21304424275 is a deficient number, since it is larger than the sum of its proper divisors (5113061857).

21304424275 is an equidigital number, since it uses as much as digits as its factorization.

21304424275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852176981 (or 852176976 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 34.

Adding to 21304424275 its reverse (57242440312), we get a palindrome (78546864587).

The spelling of 21304424275 in words is "twenty-one billion, three hundred four million, four hundred twenty-four thousand, two hundred seventy-five".