21195768 has 32 divisors (see below), whose sum is σ = 57807360. Its totient is φ = 6422880.

The previous prime is 21195767. The next prime is 21195791. The reversal of 21195768 is 86759112.

It is a super-2 number, since 2×21195768² = 898521162219648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21195767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39880 + ... + 40407.

It is an arithmetic number, because the mean of its divisors is an integer number (1806480).

Almost surely, 2^21195768 is an apocalyptic number.

It is an amenable number.

21195768 is an abundant number, since it is smaller than the sum of its proper divisors (36611592).

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

21195768 is a wasteful number, since it uses less digits than its factorization.

21195768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80307 (or 80303 counting only the distinct ones).

The product of its digits is 30240, while the sum is 39.

The square root of 21195768 is about 4603.8861845185. The cubic root of 21195768 is about 276.7470832832.

It can be divided in two parts, 2119 and 5768, that added together give a palindrome (7887).

The spelling of 21195768 in words is "twenty-one million, one hundred ninety-five thousand, seven hundred sixty-eight".