21968752 has 20 divisors (see below), whose sum is σ = 45839080. Its totient is φ = 10139328.

The previous prime is 21968741. The next prime is 21968753. The reversal of 21968752 is 25786912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21968753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52602 + ... + 53017.

It is an arithmetic number, because the mean of its divisors is an integer number (2291954).

Almost surely, 2^21968752 is an apocalyptic number.

It is an amenable number.

21968752 is an abundant number, since it is smaller than the sum of its proper divisors (23870328).

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

21968752 is a wasteful number, since it uses less digits than its factorization.

21968752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105640 (or 105634 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 21968752 is about 4687.0835281655. The cubic root of 21968752 is about 280.0712063799.

The spelling of 21968752 in words is "twenty-one million, nine hundred sixty-eight thousand, seven hundred fifty-two".