21115654360236 has 72 divisors (see below), whose sum is σ = 57064121491104. Its totient is φ = 6560203276800.

The previous prime is 21115654360231. The next prime is 21115654360237. The reversal of 21115654360236 is 63206345651112.

It is a happy number.

21115654360236 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 5 + 6 + 5 + 4 + 3 + 602 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21115654360191 and 21115654360200.

It is not an unprimeable number, because it can be changed into a prime (21115654360231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167425815 + ... + 167551886.

It is an arithmetic number, because the mean of its divisors is an integer number (792557242932).

Almost surely, 2^{21115654360236} is an apocalyptic number.

It is an amenable number.

21115654360236 is an abundant number, since it is smaller than the sum of its proper divisors (35948467130868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21115654360236 is a wasteful number, since it uses less digits than its factorization.

21115654360236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334977831 (or 334977826 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 21115654360236 in words is "twenty-one trillion, one hundred fifteen billion, six hundred fifty-four million, three hundred sixty thousand, two hundred thirty-six".