21633286936784 has 20 divisors (see below), whose sum is σ = 42601616285220. Its totient is φ = 10639321443840.

The previous prime is 21633286936673. The next prime is 21633286936867. The reversal of 21633286936784 is 48763968233612.

It can be written as a sum of positive squares in 2 ways, for example, as 12376042561600 + 9257244375184 = 3517960^2 + 3042572^2 .

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 3 ways as a sum of consecutive naturals, for example, 11082625529 + ... + 11082627480.

It is an arithmetic number, because the mean of its divisors is an integer number (2130080814261).

Almost surely, 2^{21633286936784} is an apocalyptic number.

It is an amenable number.

21633286936784 is a deficient number, since it is larger than the sum of its proper divisors (20968329348436).

21633286936784 is a wasteful number, since it uses less digits than its factorization.

21633286936784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22165253078 (or 22165253072 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 68.

The spelling of 21633286936784 in words is "twenty-one trillion, six hundred thirty-three billion, two hundred eighty-six million, nine hundred thirty-six thousand, seven hundred eighty-four".