21885166684 has 6 divisors (see below), whose sum is σ = 38299041704. Its totient is φ = 10942583340.

The previous prime is 21885166607. The next prime is 21885166727. The reversal of 21885166684 is 48666158812.

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, 2735645832 + ... + 2735645839.

Almost surely, 2^21885166684 is an apocalyptic number.

It is an amenable number.

21885166684 is a deficient number, since it is larger than the sum of its proper divisors (16413875020).

21885166684 is a wasteful number, since it uses less digits than its factorization.

21885166684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5471291675 (or 5471291673 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 55.

The spelling of 21885166684 in words is "twenty-one billion, eight hundred eighty-five million, one hundred sixty-six thousand, six hundred eighty-four".