21927952 has 20 divisors (see below), whose sum is σ = 42567340. Its totient is φ = 10942848.

The previous prime is 21927949. The next prime is 21927953. The reversal of 21927952 is 25972912.

It can be written as a sum of positive squares in 2 ways, for example, as 8503056 + 13424896 = 2916^2 + 3664^2 .

It is not an unprimeable number, because it can be changed into a prime (21927953) 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, 10378 + ... + 12310.

It is an arithmetic number, because the mean of its divisors is an integer number (2128367).

Almost surely, 2^21927952 is an apocalyptic number.

It is an amenable number.

21927952 is a deficient number, since it is larger than the sum of its proper divisors (20639388).

21927952 is a wasteful number, since it uses less digits than its factorization.

21927952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2650 (or 2644 counting only the distinct ones).

The product of its digits is 22680, while the sum is 37.

The square root of 21927952 is about 4682.7291187939. The cubic root of 21927952 is about 279.8977177435.

The spelling of 21927952 in words is "twenty-one million, nine hundred twenty-seven thousand, nine hundred fifty-two".