21010568 has 16 divisors (see below), whose sum is σ = 39935580. Its totient is φ = 10361088.

The previous prime is 21010567. The next prime is 21010579. The reversal of 21010568 is 86501012.

It can be written as a sum of positive squares in 2 ways, for example, as 18645124 + 2365444 = 4318^2 + 1538^2 .

It is not an unprimeable number, because it can be changed into a prime (21010567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17405 + ... + 18572.

Almost surely, 2^21010568 is an apocalyptic number.

It is an amenable number.

21010568 is a deficient number, since it is larger than the sum of its proper divisors (18925012).

21010568 is a wasteful number, since it uses less digits than its factorization.

21010568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36056 (or 36052 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 21010568 is about 4583.7286132580. The cubic root of 21010568 is about 275.9386897353.

The spelling of 21010568 in words is "twenty-one million, ten thousand, five hundred sixty-eight".