21068075 has 24 divisors (see below), whose sum is σ = 30117120. Its totient is φ = 14320800.

The previous prime is 21068071. The next prime is 21068087. The reversal of 21068075 is 57086012.

It is not a de Polignac number, because 21068075 - 2² = 21068071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21068071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22466 + ... + 23384.

It is an arithmetic number, because the mean of its divisors is an integer number (1254880).

Almost surely, 2^21068075 is an apocalyptic number.

21068075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21068075 is a deficient number, since it is larger than the sum of its proper divisors (9049045).

21068075 is a wasteful number, since it uses less digits than its factorization.

21068075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067 (or 1062 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 21068075 is about 4589.9972766876. The cubic root of 21068075 is about 276.1902131695.

The spelling of 21068075 in words is "twenty-one million, sixty-eight thousand, seventy-five".