21789368 has 16 divisors (see below), whose sum is σ = 41852160. Its totient is φ = 10628800.

The previous prime is 21789367. The next prime is 21789377. The reversal of 21789368 is 86398712.

It is a super-3 number, since 3×21789368³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21789367) by changing a digit.

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, 32888 + ... + 33543.

It is an arithmetic number, because the mean of its divisors is an integer number (2615760).

Almost surely, 2^21789368 is an apocalyptic number.

It is an amenable number.

21789368 is a deficient number, since it is larger than the sum of its proper divisors (20062792).

21789368 is a wasteful number, since it uses less digits than its factorization.

21789368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66478 (or 66474 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 21789368 is about 4667.9083110104. The cubic root of 21789368 is about 279.3068227787.

The spelling of 21789368 in words is "twenty-one million, seven hundred eighty-nine thousand, three hundred sixty-eight".