21068195 has 4 divisors (see below), whose sum is σ = 25281840. Its totient is φ = 16854552.

The previous prime is 21068183. The next prime is 21068209. The reversal of 21068195 is 59186012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21068195 - 2⁸ = 21067939 is a prime.

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, 2106815 + ... + 2106824.

It is an arithmetic number, because the mean of its divisors is an integer number (6320460).

Almost surely, 2^21068195 is an apocalyptic number.

21068195 is a deficient number, since it is larger than the sum of its proper divisors (4213645).

21068195 is an equidigital number, since it uses as much as digits as its factorization.

21068195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213644.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 21068195 is about 4590.0103485722. The cubic root of 21068195 is about 276.1907375453.

It can be divided in two parts, 2106 and 8195, that added together give a palindrome (10301).

The spelling of 21068195 in words is "twenty-one million, sixty-eight thousand, one hundred ninety-five".