21952384 has 64 divisors (see below), whose sum is σ = 46267200. Its totient is φ = 10362880.

The previous prime is 21952339. The next prime is 21952387. The reversal of 21952384 is 48325912.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×21952384³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21952387) by changing a digit.

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, 246612 + ... + 246700.

It is an arithmetic number, because the mean of its divisors is an integer number (722925).

Almost surely, 2^21952384 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 21952384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23133600).

21952384 is an abundant number, since it is smaller than the sum of its proper divisors (24314816).

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

21952384 is an equidigital number, since it uses as much as digits as its factorization.

21952384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 179 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 21952384 is about 4685.3371276782. The cubic root of 21952384 is about 280.0016326435.

The spelling of 21952384 in words is "twenty-one million, nine hundred fifty-two thousand, three hundred eighty-four".