21966924 has 48 divisors (see below), whose sum is σ = 62028288. Its totient is φ = 5906688.

The previous prime is 21966899. The next prime is 21966961. The reversal of 21966924 is 42966912.

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 15 ways as a sum of consecutive naturals, for example, 6264 + ... + 9119.

It is an arithmetic number, because the mean of its divisors is an integer number (1292256).

Almost surely, 2^21966924 is an apocalyptic number.

It is an amenable number.

21966924 is an abundant number, since it is smaller than the sum of its proper divisors (40061364).

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

21966924 is a wasteful number, since it uses less digits than its factorization.

21966924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15414 (or 15412 counting only the distinct ones).

The product of its digits is 46656, while the sum is 39.

The square root of 21966924 is about 4686.8885201165. Note that the first 3 decimals coincide. The cubic root of 21966924 is about 280.0634380071.

The spelling of 21966924 in words is "twenty-one million, nine hundred sixty-six thousand, nine hundred twenty-four".