21168924 has 48 divisors (see below), whose sum is σ = 58910208. Its totient is φ = 5784768.

The previous prime is 21168923. The next prime is 21168949. The reversal of 21168924 is 42986112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21168923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3547 + ... + 7410.

It is an arithmetic number, because the mean of its divisors is an integer number (1227296).

Almost surely, 2^21168924 is an apocalyptic number.

It is an amenable number.

21168924 is an abundant number, since it is smaller than the sum of its proper divisors (37741284).

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

21168924 is a wasteful number, since it uses less digits than its factorization.

21168924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10994 (or 10992 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 21168924 is about 4600.9698977498. The cubic root of 21168924 is about 276.6302024490.

The spelling of 21168924 in words is "twenty-one million, one hundred sixty-eight thousand, nine hundred twenty-four".