21716427684 has 48 divisors (see below), whose sum is σ = 60428325888. Its totient is φ = 5934923808.

The previous prime is 21716427683. The next prime is 21716427697. The reversal of 21716427684 is 48672461712.

It is not an unprimeable number, because it can be changed into a prime (21716427683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5618262 + ... + 5622125.

It is an arithmetic number, because the mean of its divisors is an integer number (1258923456).

Almost surely, 2^21716427684 is an apocalyptic number.

It is an amenable number.

21716427684 is an abundant number, since it is smaller than the sum of its proper divisors (38711898204).

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

21716427684 is a wasteful number, since it uses less digits than its factorization.

21716427684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11240424 (or 11240422 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The spelling of 21716427684 in words is "twenty-one billion, seven hundred sixteen million, four hundred twenty-seven thousand, six hundred eighty-four".