21884539684 has 12 divisors (see below), whose sum is σ = 43769079424. Its totient is φ = 9379088424.

The previous prime is 21884539657. The next prime is 21884539687. The reversal of 21884539684 is 48693548812.

21884539684 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21884539687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390795324 + ... + 390795379.

Almost surely, 2^21884539684 is an apocalyptic number.

It is an amenable number.

21884539684 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21884539684 is a wasteful number, since it uses less digits than its factorization.

21884539684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781590714 (or 781590712 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 58.

The spelling of 21884539684 in words is "twenty-one billion, eight hundred eighty-four million, five hundred thirty-nine thousand, six hundred eighty-four".