21015540211325 has 96 divisors (see below), whose sum is σ = 30420910437120. Its totient is φ = 14231966515200.

The previous prime is 21015540211319. The next prime is 21015540211357. The reversal of 21015540211325 is 52311204551012.

It is not a de Polignac number, because 21015540211325 - 2³⁶ = 20946820734589 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21015540211291 and 21015540211300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1883276096 + ... + 1883287254.

It is an arithmetic number, because the mean of its divisors is an integer number (316884483720).

Almost surely, 2^{21015540211325} is an apocalyptic number.

21015540211325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21015540211325 is a deficient number, since it is larger than the sum of its proper divisors (9405370225795).

21015540211325 is a wasteful number, since it uses less digits than its factorization.

21015540211325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15447 (or 15442 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 21015540211325 its reverse (52311204551012), we get a palindrome (73326744762337).

The spelling of 21015540211325 in words is "twenty-one trillion, fifteen billion, five hundred forty million, two hundred eleven thousand, three hundred twenty-five".