21068530 has 96 divisors (see below), whose sum is σ = 48591360. Its totient is φ = 6531840.

The previous prime is 21068527. The next prime is 21068533. The reversal of 21068530 is 3586012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21068527) and next prime (21068533).

It is a junction number, because it is equal to n+sod(n) for n = 21068495 and 21068504.

It is not an unprimeable number, because it can be changed into a prime (21068533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 288574 + ... + 288646.

It is an arithmetic number, because the mean of its divisors is an integer number (506160).

Almost surely, 2^21068530 is an apocalyptic number.

21068530 is an abundant number, since it is smaller than the sum of its proper divisors (27522830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21068530 is a wasteful number, since it uses less digits than its factorization.

21068530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21068530 is about 4590.0468407196. The cubic root of 21068530 is about 276.1922014170.

The spelling of 21068530 in words is "twenty-one million, sixty-eight thousand, five hundred thirty".