21352787688325 has 6 divisors (see below), whose sum is σ = 26477456733554. Its totient is φ = 17082230150640.

The previous prime is 21352787688317. The next prime is 21352787688359. The reversal of 21352787688325 is 52388678725312.

It can be written as a sum of positive squares in 3 ways, for example, as 337228749796 + 21015558938529 = 580714^2 + 4584273^2 .

It is not a de Polignac number, because 21352787688325 - 2³ = 21352787688317 is a prime.

It is a Duffinian number.

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, 427055753742 + ... + 427055753791.

Almost surely, 2^{21352787688325} is an apocalyptic number.

21352787688325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21352787688325 is a deficient number, since it is larger than the sum of its proper divisors (5124669045229).

21352787688325 is an equidigital number, since it uses as much as digits as its factorization.

21352787688325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854111507543 (or 854111507538 counting only the distinct ones).

The product of its digits is 270950400, while the sum is 67.

The spelling of 21352787688325 in words is "twenty-one trillion, three hundred fifty-two billion, seven hundred eighty-seven million, six hundred eighty-eight thousand, three hundred twenty-five".