21092768 has 24 divisors (see below), whose sum is σ = 41785632. Its totient is φ = 10480576.

The previous prime is 21092759. The next prime is 21092779. The reversal of 21092768 is 86729012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3371 + ... + 7317.

It is an arithmetic number, because the mean of its divisors is an integer number (1741068).

Almost surely, 2^21092768 is an apocalyptic number.

It is an amenable number.

21092768 is a deficient number, since it is larger than the sum of its proper divisors (20692864).

21092768 is a wasteful number, since it uses less digits than its factorization.

21092768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124 (or 4116 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 21092768 is about 4592.6863598552. The cubic root of 21092768 is about 276.2980746646.

The spelling of 21092768 in words is "twenty-one million, ninety-two thousand, seven hundred sixty-eight".