21093568 has 14 divisors (see below), whose sum is σ = 41857676. Its totient is φ = 10546752.

The previous prime is 21093563. The next prime is 21093577. The reversal of 21093568 is 86539012.

It is a super-2 number, since 2×21093568² = 889877221941248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21093563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164730 + ... + 164857.

It is an arithmetic number, because the mean of its divisors is an integer number (2989834).

Almost surely, 2^21093568 is an apocalyptic number.

It is an amenable number.

21093568 is a deficient number, since it is larger than the sum of its proper divisors (20764108).

21093568 is an equidigital number, since it uses as much as digits as its factorization.

21093568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329599 (or 329589 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 21093568 is about 4592.7734540254. The cubic root of 21093568 is about 276.3015677365.

The spelling of 21093568 in words is "twenty-one million, ninety-three thousand, five hundred sixty-eight".