21968844 has 24 divisors (see below), whose sum is σ = 51433200. Its totient is φ = 7298304.

The previous prime is 21968819. The next prime is 21968867. The reversal of 21968844 is 44886912.

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21968796 and 21968805.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 832 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (2143050).

Almost surely, 2^21968844 is an apocalyptic number.

It is an amenable number.

21968844 is an abundant number, since it is smaller than the sum of its proper divisors (29464356).

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

21968844 is a wasteful number, since it uses less digits than its factorization.

21968844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6169 (or 6167 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 21968844 is about 4687.0933423605. The cubic root of 21968844 is about 280.0715973369.

The spelling of 21968844 in words is "twenty-one million, nine hundred sixty-eight thousand, eight hundred forty-four".