21793768 has 16 divisors (see below), whose sum is σ = 41060160. Its totient is φ = 10844400.

The previous prime is 21793763. The next prime is 21793769. The reversal of 21793768 is 86739712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21793763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4768 + ... + 8143.

It is an arithmetic number, because the mean of its divisors is an integer number (2566260).

Almost surely, 2^21793768 is an apocalyptic number.

It is an amenable number.

21793768 is a deficient number, since it is larger than the sum of its proper divisors (19266392).

21793768 is a wasteful number, since it uses less digits than its factorization.

21793768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13128 (or 13124 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 21793768 is about 4668.3795903932. The cubic root of 21793768 is about 279.3256219672.

The spelling of 21793768 in words is "twenty-one million, seven hundred ninety-three thousand, seven hundred sixty-eight".