21966504 has 48 divisors (see below), whose sum is σ = 63885600. Its totient is φ = 6275808.

The previous prime is 21966491. The next prime is 21966521. The reversal of 21966504 is 40566912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8164 + ... + 10515.

It is an arithmetic number, because the mean of its divisors is an integer number (1330950).

Almost surely, 2^21966504 is an apocalyptic number.

21966504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21966504 is an abundant number, since it is smaller than the sum of its proper divisors (41919096).

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

21966504 is a wasteful number, since it uses less digits than its factorization.

21966504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18702 (or 18691 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 21966504 is about 4686.8437140575. The cubic root of 21966504 is about 280.0616530903.

The spelling of 21966504 in words is "twenty-one million, nine hundred sixty-six thousand, five hundred four".