21986386684 has 6 divisors (see below), whose sum is σ = 38476176704. Its totient is φ = 10993193340.

The previous prime is 21986386673. The next prime is 21986386691. The reversal of 21986386684 is 48668368912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2748298332 + ... + 2748298339.

Almost surely, 2^21986386684 is an apocalyptic number.

It is an amenable number.

21986386684 is a deficient number, since it is larger than the sum of its proper divisors (16489790020).

21986386684 is a wasteful number, since it uses less digits than its factorization.

21986386684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496596675 (or 5496596673 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 61.

The spelling of 21986386684 in words is "twenty-one billion, nine hundred eighty-six million, three hundred eighty-six thousand, six hundred eighty-four".