21895324 has 24 divisors (see below), whose sum is σ = 42336000. Its totient is φ = 9824880.

The previous prime is 21895309. The next prime is 21895343. The reversal of 21895324 is 42359812.

It is a self number, because there is not a number n which added to its sum of digits gives 21895324.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327 + ... + 6625.

It is an arithmetic number, because the mean of its divisors is an integer number (1764000).

Almost surely, 2^21895324 is an apocalyptic number.

It is an amenable number.

21895324 is a deficient number, since it is larger than the sum of its proper divisors (20440676).

21895324 is a wasteful number, since it uses less digits than its factorization.

21895324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393 (or 6391 counting only the distinct ones).

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

The square root of 21895324 is about 4679.2439560254. The cubic root of 21895324 is about 279.7588229348.

The spelling of 21895324 in words is "twenty-one million, eight hundred ninety-five thousand, three hundred twenty-four".