21600636013 has 12 divisors (see below), whose sum is σ = 23752899324. Its totient is φ = 19628628800.

The previous prime is 21600636011. The next prime is 21600636017. The reversal of 21600636013 is 31063600612.

It can be written as a sum of positive squares in 2 ways, for example, as 8818524649 + 12782111364 = 93907^2 + 113058^2 .

It is not a de Polignac number, because 21600636013 - 2¹ = 21600636011 is a prime.

It is a super-2 number, since 2×21600636013² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600636011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258795 + ... + 331927.

It is an arithmetic number, because the mean of its divisors is an integer number (1979408277).

Almost surely, 2^21600636013 is an apocalyptic number.

It is an amenable number.

21600636013 is a deficient number, since it is larger than the sum of its proper divisors (2152263311).

21600636013 is a wasteful number, since it uses less digits than its factorization.

21600636013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75596 (or 75585 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21600636013 in words is "twenty-one billion, six hundred million, six hundred thirty-six thousand, thirteen".