21952304 has 120 divisors (see below), whose sum is σ = 53434080. Its totient is φ = 8673280.

The previous prime is 21952297. The next prime is 21952313. The reversal of 21952304 is 40325912.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 756962 + ... + 756990.

It is an arithmetic number, because the mean of its divisors is an integer number (445284).

Almost surely, 2^21952304 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 21952304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26717040).

21952304 is an abundant number, since it is smaller than the sum of its proper divisors (31481776).

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

21952304 is a wasteful number, since it uses less digits than its factorization.

21952304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 21952304 is about 4685.3285903979. The cubic root of 21952304 is about 280.0012925110.

The spelling of 21952304 in words is "twenty-one million, nine hundred fifty-two thousand, three hundred four".