21794786634 has 32 divisors (see below), whose sum is σ = 44428809600. Its totient is φ = 7126382592.

The previous prime is 21794786621. The next prime is 21794786669. The reversal of 21794786634 is 43668749712.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 99934 + ... + 231465.

It is an arithmetic number, because the mean of its divisors is an integer number (1388400300).

Almost surely, 2^21794786634 is an apocalyptic number.

21794786634 is an abundant number, since it is smaller than the sum of its proper divisors (22634022966).

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

21794786634 is a wasteful number, since it uses less digits than its factorization.

21794786634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331614.

The product of its digits is 12192768, while the sum is 57.

The spelling of 21794786634 in words is "twenty-one billion, seven hundred ninety-four million, seven hundred eighty-six thousand, six hundred thirty-four".