21965696 has 32 divisors (see below), whose sum is σ = 44394480. Its totient is φ = 10823680.

The previous prime is 21965693. The next prime is 21965707. The reversal of 21965696 is 69656912.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21965693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7880 + ... + 10296.

Almost surely, 2^21965696 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 21965696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22197240).

21965696 is an abundant number, since it is smaller than the sum of its proper divisors (22428784).

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

21965696 is an equidigital number, since it uses as much as digits as its factorization.

21965696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502 (or 2490 counting only the distinct ones).

The product of its digits is 174960, while the sum is 44.

The square root of 21965696 is about 4686.7575145296. The cubic root of 21965696 is about 280.0582191864.

The spelling of 21965696 in words is "twenty-one million, nine hundred sixty-five thousand, six hundred ninety-six".