21935968 has 48 divisors (see below), whose sum is σ = 45045504. Its totient is φ = 10506240.

The previous prime is 21935939. The next prime is 21935983. The reversal of 21935968 is 86953912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114753 + ... + 114943.

It is an arithmetic number, because the mean of its divisors is an integer number (938448).

Almost surely, 2^21935968 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 21935968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22522752).

21935968 is an abundant number, since it is smaller than the sum of its proper divisors (23109536).

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

21935968 is a wasteful number, since it uses less digits than its factorization.

21935968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 327 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The square root of 21935968 is about 4683.5849517223. The cubic root of 21935968 is about 279.9318201343.

The spelling of 21935968 in words is "twenty-one million, nine hundred thirty-five thousand, nine hundred sixty-eight".