21344168 has 16 divisors (see below), whose sum is σ = 40951680. Its totient is φ = 10423728.

The previous prime is 21344159. The next prime is 21344173. The reversal of 21344168 is 86144312.

It is a super-2 number, since 2×21344168² = 911147015224448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21344168.

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 3 ways as a sum of consecutive naturals, for example, 30680 + ... + 31367.

It is an arithmetic number, because the mean of its divisors is an integer number (2559480).

Almost surely, 2^21344168 is an apocalyptic number.

It is an amenable number.

21344168 is a deficient number, since it is larger than the sum of its proper divisors (19607512).

21344168 is a wasteful number, since it uses less digits than its factorization.

21344168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62096 (or 62092 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 21344168 is about 4619.9748917067. The cubic root of 21344168 is about 277.3914539082.

It can be divided in two parts, 21344 and 168, that added together give a palindrome (21512).

The spelling of 21344168 in words is "twenty-one million, three hundred forty-four thousand, one hundred sixty-eight".