21068536 has 16 divisors (see below), whose sum is σ = 39552840. Its totient is φ = 10521120.

The previous prime is 21068533. The next prime is 21068539. The reversal of 21068536 is 63586012.

It is an interprime number because it is at equal distance from previous prime (21068533) and next prime (21068539).

It is a junction number, because it is equal to n+sod(n) for n = 21068498 and 21068507.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 10095 + ... + 12001.

Almost surely, 2^21068536 is an apocalyptic number.

It is an amenable number.

21068536 is a deficient number, since it is larger than the sum of its proper divisors (18484304).

21068536 is a wasteful number, since it uses less digits than its factorization.

21068536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294 (or 3290 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21068536 is about 4590.0474943077. The cubic root of 21068536 is about 276.1922276355.

The spelling of 21068536 in words is "twenty-one million, sixty-eight thousand, five hundred thirty-six".