21185952 has 24 divisors (see below), whose sum is σ = 55613376. Its totient is φ = 7061952.

The previous prime is 21185947. The next prime is 21185953. The reversal of 21185952 is 25958112.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (21185953) 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, 110248 + ... + 110439.

It is an arithmetic number, because the mean of its divisors is an integer number (2317224).

Almost surely, 2^21185952 is an apocalyptic number.

It is an amenable number.

21185952 is an abundant number, since it is smaller than the sum of its proper divisors (34427424).

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

21185952 is a wasteful number, since it uses less digits than its factorization.

21185952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220700 (or 220692 counting only the distinct ones).

The product of its digits is 7200, while the sum is 33.

The square root of 21185952 is about 4602.8200051707. The cubic root of 21185952 is about 276.7043551180.

The spelling of 21185952 in words is "twenty-one million, one hundred eighty-five thousand, nine hundred fifty-two".