21826568 has 8 divisors (see below), whose sum is σ = 40924830. Its totient is φ = 10913280.

The previous prime is 21826561. The next prime is 21826577. The reversal of 21826568 is 86562812.

It can be written as a sum of positive squares in only one way, i.e., 17656804 + 4169764 = 4202^2 + 2042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21826561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364153 + ... + 1364168.

Almost surely, 2^21826568 is an apocalyptic number.

It is an amenable number.

21826568 is a deficient number, since it is larger than the sum of its proper divisors (19098262).

21826568 is a wasteful number, since it uses less digits than its factorization.

21826568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728327 (or 2728323 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 21826568 is about 4671.8912658580. The cubic root of 21826568 is about 279.4656817001.

The spelling of 21826568 in words is "twenty-one million, eight hundred twenty-six thousand, five hundred sixty-eight".