21996718634 has 8 divisors (see below), whose sum is σ = 35994630528. Its totient is φ = 9998508460.

The previous prime is 21996718613. The next prime is 21996718637. The reversal of 21996718634 is 43681769912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21996718634.

It is not an unprimeable number, because it can be changed into a prime (21996718637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499925402 + ... + 499925445.

It is an arithmetic number, because the mean of its divisors is an integer number (4499328816).

Almost surely, 2^21996718634 is an apocalyptic number.

21996718634 is a deficient number, since it is larger than the sum of its proper divisors (13997911894).

21996718634 is a wasteful number, since it uses less digits than its factorization.

21996718634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999850860.

The product of its digits is 3919104, while the sum is 56.

The spelling of 21996718634 in words is "twenty-one billion, nine hundred ninety-six million, seven hundred eighteen thousand, six hundred thirty-four".