21968860984 has 64 divisors (see below), whose sum is σ = 47939040000. Its totient is φ = 9243080448.

The previous prime is 21968860873. The next prime is 21968861027. The reversal of 21968860984 is 48906886912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2668827 + ... + 2677045.

It is an arithmetic number, because the mean of its divisors is an integer number (749047500).

Almost surely, 2^21968860984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21968860984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23969520000).

21968860984 is an abundant number, since it is smaller than the sum of its proper divisors (25970179016).

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

21968860984 is a wasteful number, since it uses less digits than its factorization.

21968860984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9100 (or 9096 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 21968860984 in words is "twenty-one billion, nine hundred sixty-eight million, eight hundred sixty thousand, nine hundred eighty-four".