21794786633 has 4 divisors (see below), whose sum is σ = 22093345428. Its totient is φ = 21496227840.

The previous prime is 21794786621. The next prime is 21794786669. The reversal of 21794786633 is 33668749712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15678295369 + 6116491264 = 125213^2 + 78208^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21794786633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21794726633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149279288 + ... + 149279433.

It is an arithmetic number, because the mean of its divisors is an integer number (5523336357).

Almost surely, 2^21794786633 is an apocalyptic number.

It is an amenable number.

21794786633 is a deficient number, since it is larger than the sum of its proper divisors (298558795).

21794786633 is an equidigital number, since it uses as much as digits as its factorization.

21794786633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298558794.

The product of its digits is 9144576, while the sum is 56.

The spelling of 21794786633 in words is "twenty-one billion, seven hundred ninety-four million, seven hundred eighty-six thousand, six hundred thirty-three".