21967648 has 24 divisors (see below), whose sum is σ = 45526320. Its totient is φ = 10405440.

The previous prime is 21967637. The next prime is 21967651. The reversal of 21967648 is 84676912.

It is a plaindrome in base 11.

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 3 ways as a sum of consecutive naturals, for example, 17458 + ... + 18673.

It is an arithmetic number, because the mean of its divisors is an integer number (1896930).

Almost surely, 2^21967648 is an apocalyptic number.

It is an amenable number.

21967648 is an abundant number, since it is smaller than the sum of its proper divisors (23558672).

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

21967648 is a wasteful number, since it uses less digits than its factorization.

21967648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36160 (or 36152 counting only the distinct ones).

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

The square root of 21967648 is about 4686.9657562222. The cubic root of 21967648 is about 280.0665148102.

The spelling of 21967648 in words is "twenty-one million, nine hundred sixty-seven thousand, six hundred forty-eight".