21303410525 has 6 divisors (see below), whose sum is σ = 26416229082. Its totient is φ = 17042728400.

The previous prime is 21303410503. The next prime is 21303410537. The reversal of 21303410525 is 52501430312.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3230103556 + 18073306969 = 56834^2 + 134437^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21303410525 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21303410494 and 21303410503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 426068186 + ... + 426068235.

It is an arithmetic number, because the mean of its divisors is an integer number (4402704847).

Almost surely, 2^21303410525 is an apocalyptic number.

21303410525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21303410525 is a deficient number, since it is larger than the sum of its proper divisors (5112818557).

21303410525 is an equidigital number, since it uses as much as digits as its factorization.

21303410525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852136431 (or 852136426 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21303410525 its reverse (52501430312), we get a palindrome (73804840837).

The spelling of 21303410525 in words is "twenty-one billion, three hundred three million, four hundred ten thousand, five hundred twenty-five".