21636341325 has 30 divisors (see below), whose sum is σ = 40077987114. Its totient is φ = 11539380960.

The previous prime is 21636341323. The next prime is 21636341357. The reversal of 21636341325 is 52314363612.

21636341325 is a `hidden beast` number, since 2 + 1 + 6 + 3 + 634 + 13 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 4891463721 + 16744877604 = 69939^2 + 129402^2 .

It is not a de Polignac number, because 21636341325 - 2¹ = 21636341323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21636341325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21636341323) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 5340282 + ... + 5344331.

Almost surely, 2^21636341325 is an apocalyptic number.

21636341325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21636341325 is a deficient number, since it is larger than the sum of its proper divisors (18441645789).

21636341325 is a wasteful number, since it uses less digits than its factorization.

21636341325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10684635 (or 10684621 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The spelling of 21636341325 in words is "twenty-one billion, six hundred thirty-six million, three hundred forty-one thousand, three hundred twenty-five".