21864976 has 45 divisors (see below), whose sum is σ = 49576719. Its totient is φ = 9314592.

The previous prime is 21864959. The next prime is 21864989. The reversal of 21864976 is 67946812.

The square root of 21864976 is 4676.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 130845 + ... + 131011.

Almost surely, 2^21864976 is an apocalyptic number.

21864976 is the 4676-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21864976

21864976 is an abundant number, since it is smaller than the sum of its proper divisors (27711743).

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

21864976 is an equidigital number, since it uses as much as digits as its factorization.

21864976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 176 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The cubic root of 21864976 is about 279.6295099918.

The spelling of 21864976 in words is "twenty-one million, eight hundred sixty-four thousand, nine hundred seventy-six".