21952844 has 12 divisors (see below), whose sum is σ = 38556168. Its totient is φ = 10936800.

The previous prime is 21952841. The next prime is 21952859. The reversal of 21952844 is 44825912.

It is not an unprimeable number, because it can be changed into a prime (21952841) 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, 8642 + ... + 10889.

It is an arithmetic number, because the mean of its divisors is an integer number (3213014).

Almost surely, 2^21952844 is an apocalyptic number.

It is an amenable number.

21952844 is a deficient number, since it is larger than the sum of its proper divisors (16603324).

21952844 is a wasteful number, since it uses less digits than its factorization.

21952844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19816 (or 19814 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 21952844 is about 4685.3862167382. The cubic root of 21952844 is about 280.0035883894.

The spelling of 21952844 in words is "twenty-one million, nine hundred fifty-two thousand, eight hundred forty-four".