21304005025 has 6 divisors (see below), whose sum is σ = 26416966262. Its totient is φ = 17043204000.

The previous prime is 21304004989. The next prime is 21304005049. The reversal of 21304005025 is 52050040312.

It can be written as a sum of positive squares in 3 ways, for example, as 4270883904 + 17033121121 = 65352^2 + 130511^2 .

It is not a de Polignac number, because 21304005025 - 2²³ = 21295616417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21304004987 and 21304005005.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 426080076 + ... + 426080125.

Almost surely, 2^21304005025 is an apocalyptic number.

21304005025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21304005025 is a deficient number, since it is larger than the sum of its proper divisors (5112961237).

21304005025 is an equidigital number, since it uses as much as digits as its factorization.

21304005025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852160211 (or 852160206 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 21304005025 its reverse (52050040312), we get a palindrome (73354045337).

The spelling of 21304005025 in words is "twenty-one billion, three hundred four million, five thousand, twenty-five".