21976340344 has 64 divisors (see below), whose sum is σ = 47721312000. Its totient is φ = 9293351424.

The previous prime is 21976340327. The next prime is 21976340359. The reversal of 21976340344 is 44304367912.

It is a self number, because there is not a number n which added to its sum of digits gives 21976340344.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1428807 + ... + 1444105.

It is an arithmetic number, because the mean of its divisors is an integer number (745645500).

Almost surely, 2^21976340344 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 21976340344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23860656000).

21976340344 is an abundant number, since it is smaller than the sum of its proper divisors (25744971656).

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

21976340344 is a wasteful number, since it uses less digits than its factorization.

21976340344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15652 (or 15648 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 21976340344 in words is "twenty-one billion, nine hundred seventy-six million, three hundred forty thousand, three hundred forty-four".