21109600036 has 36 divisors (see below), whose sum is σ = 43083740700. Its totient is φ = 9023681856.

The previous prime is 21109600027. The next prime is 21109600093. The reversal of 21109600036 is 63000690112.

It can be written as a sum of positive squares in 2 ways, for example, as 5654137636 + 15455462400 = 75194^2 + 124320^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 21109599977 and 21109600013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62191 + ... + 214678.

It is an arithmetic number, because the mean of its divisors is an integer number (1196770575).

Almost surely, 2^21109600036 is an apocalyptic number.

It is an amenable number.

21109600036 is an abundant number, since it is smaller than the sum of its proper divisors (21974140664).

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

21109600036 is a wasteful number, since it uses less digits than its factorization.

21109600036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277276 (or 277267 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The spelling of 21109600036 in words is "twenty-one billion, one hundred nine million, six hundred thousand, thirty-six".