21068185 has 16 divisors (see below), whose sum is σ = 27153792. Its totient is φ = 15635200.

The previous prime is 21068183. The next prime is 21068209. The reversal of 21068185 is 58186012.

It is not a de Polignac number, because 21068185 - 2¹ = 21068183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21068183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4290 + ... + 7780.

It is an arithmetic number, because the mean of its divisors is an integer number (1697112).

Almost surely, 2^21068185 is an apocalyptic number.

It is an amenable number.

21068185 is a deficient number, since it is larger than the sum of its proper divisors (6085607).

21068185 is a wasteful number, since it uses less digits than its factorization.

21068185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 21068185 is about 4590.0092592499. The cubic root of 21068185 is about 276.1906938474.

The spelling of 21068185 in words is "twenty-one million, sixty-eight thousand, one hundred eighty-five".