21395168 has 12 divisors (see below), whose sum is σ = 42121800. Its totient is φ = 10697568.

The previous prime is 21395167. The next prime is 21395173. The reversal of 21395168 is 86159312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334268 + ... + 334331.

It is an arithmetic number, because the mean of its divisors is an integer number (3510150).

Almost surely, 2^21395168 is an apocalyptic number.

It is an amenable number.

21395168 is a deficient number, since it is larger than the sum of its proper divisors (20726632).

21395168 is an equidigital number, since it uses as much as digits as its factorization.

21395168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668609 (or 668601 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 21395168 is about 4625.4911090607. The cubic root of 21395168 is about 277.6122122818.

The spelling of 21395168 in words is "twenty-one million, three hundred ninety-five thousand, one hundred sixty-eight".