21000068 has 12 divisors (see below), whose sum is σ = 36943872. Its totient is φ = 10444680.

The previous prime is 21000059. The next prime is 21000097. The reversal of 21000068 is 86000012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12980 + ... + 14507.

It is an arithmetic number, because the mean of its divisors is an integer number (3078656).

Almost surely, 2^21000068 is an apocalyptic number.

It is an amenable number.

21000068 is a deficient number, since it is larger than the sum of its proper divisors (15943804).

21000068 is a wasteful number, since it uses less digits than its factorization.

21000068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27682 (or 27680 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21000068 is about 4582.5831143581. The cubic root of 21000068 is about 275.8927154264.

The spelling of 21000068 in words is "twenty-one million, sixty-eight", and thus it is an aban number and an uban number.