21304434325 has 6 divisors (see below), whose sum is σ = 26417498594. Its totient is φ = 17043547440.

The previous prime is 21304434299. The next prime is 21304434367. The reversal of 21304434325 is 52343440312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2469891204 + 18834543121 = 49698^2 + 137239^2 .

It is not a de Polignac number, because 21304434325 - 2¹³ = 21304426133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 426088662 + ... + 426088711.

Almost surely, 2^21304434325 is an apocalyptic number.

21304434325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21304434325 is a deficient number, since it is larger than the sum of its proper divisors (5113064269).

21304434325 is an equidigital number, since it uses as much as digits as its factorization.

21304434325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852177383 (or 852177378 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 21304434325 its reverse (52343440312), we get a palindrome (73647874637).

The spelling of 21304434325 in words is "twenty-one billion, three hundred four million, four hundred thirty-four thousand, three hundred twenty-five".