21828068 has 24 divisors (see below), whose sum is σ = 41844600. Its totient is φ = 9916928.

The previous prime is 21828067. The next prime is 21828071. The reversal of 21828068 is 86082812.

It can be written as a sum of positive squares in 4 ways, for example, as 2096704 + 19731364 = 1448^2 + 4442^2 .

It is a super-2 number, since 2×21828068² = 952929105225248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21828067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3563 + ... + 7506.

It is an arithmetic number, because the mean of its divisors is an integer number (1743525).

Almost surely, 2^21828068 is an apocalyptic number.

It is an amenable number.

21828068 is a deficient number, since it is larger than the sum of its proper divisors (20016532).

21828068 is a wasteful number, since it uses less digits than its factorization.

21828068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11119 (or 11117 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 21828068 is about 4672.0517976581. The cubic root of 21828068 is about 279.4720835146.

The spelling of 21828068 in words is "twenty-one million, eight hundred twenty-eight thousand, sixty-eight".