21303112304225 has 6 divisors (see below), whose sum is σ = 26415859257270. Its totient is φ = 17042489843360.

The previous prime is 21303112304219. The next prime is 21303112304237. The reversal of 21303112304225 is 52240321130312.

It can be written as a sum of positive squares in 3 ways, for example, as 6370823354401 + 14932288949824 = 2524049^2 + 3864232^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21303112304225 is a prime.

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, 426062246060 + ... + 426062246109.

It is an arithmetic number, because the mean of its divisors is an integer number (4402643209545).

Almost surely, 2^{21303112304225} is an apocalyptic number.

21303112304225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21303112304225 is a deficient number, since it is larger than the sum of its proper divisors (5112746953045).

21303112304225 is an equidigital number, since it uses as much as digits as its factorization.

21303112304225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852124492179 (or 852124492174 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 21303112304225 its reverse (52240321130312), we get a palindrome (73543433434537).

The spelling of 21303112304225 in words is "twenty-one trillion, three hundred three billion, one hundred twelve million, three hundred four thousand, two hundred twenty-five".