21183047136 has 36 divisors (see below), whose sum is σ = 60239291112. Its totient is φ = 7061015616.

The previous prime is 21183047117. The next prime is 21183047141. The reversal of 21183047136 is 63174038112.

It is a happy number.

21183047136 is a `hidden beast` number, since 2 + 1 + 183 + 0 + 471 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21183047136.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 36775836 + ... + 36776411.

It is an arithmetic number, because the mean of its divisors is an integer number (1673313642).

Almost surely, 2^21183047136 is an apocalyptic number.

It is an amenable number.

21183047136 is an abundant number, since it is smaller than the sum of its proper divisors (39056243976).

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

21183047136 is a wasteful number, since it uses less digits than its factorization.

21183047136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73552263 (or 73552252 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 21183047136 in words is "twenty-one billion, one hundred eighty-three million, forty-seven thousand, one hundred thirty-six".