21541351315325 has 6 divisors (see below), whose sum is σ = 26711275631034. Its totient is φ = 17233081052240.

The previous prime is 21541351315307. The next prime is 21541351315327. The reversal of 21541351315325 is 52351315314512.

It can be written as a sum of positive squares in 3 ways, for example, as 197856825721 + 21343494489604 = 444811^2 + 4619902^2 .

It is not a de Polignac number, because 21541351315325 - 2²⁶ = 21541284206461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541351315327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 430827026282 + ... + 430827026331.

It is an arithmetic number, because the mean of its divisors is an integer number (4451879271839).

Almost surely, 2^{21541351315325} is an apocalyptic number.

21541351315325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21541351315325 is a deficient number, since it is larger than the sum of its proper divisors (5169924315709).

21541351315325 is an equidigital number, since it uses as much as digits as its factorization.

21541351315325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861654052623 (or 861654052618 counting only the distinct ones).

The product of its digits is 270000, while the sum is 41.

Adding to 21541351315325 its reverse (52351315314512), we get a palindrome (73892666629837).

The spelling of 21541351315325 in words is "twenty-one trillion, five hundred forty-one billion, three hundred fifty-one million, three hundred fifteen thousand, three hundred twenty-five".