21182368 has 12 divisors (see below), whose sum is σ = 41702850. Its totient is φ = 10591168.

The previous prime is 21182327. The next prime is 21182377. The reversal of 21182368 is 86328112.

It can be written as a sum of positive squares in only one way, i.e., 13630864 + 7551504 = 3692^2 + 2748^2 .

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 as a sum of consecutive naturals, namely, 330943 + ... + 331006.

Almost surely, 2^21182368 is an apocalyptic number.

It is an amenable number.

21182368 is a deficient number, since it is larger than the sum of its proper divisors (20520482).

21182368 is an equidigital number, since it uses as much as digits as its factorization.

21182368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661959 (or 661951 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 21182368 is about 4602.4306621610. The cubic root of 21182368 is about 276.6887509992.

The spelling of 21182368 in words is "twenty-one million, one hundred eighty-two thousand, three hundred sixty-eight".