21095895 has 16 divisors (see below), whose sum is σ = 35739360. Its totient is φ = 10589184.

The previous prime is 21095881. The next prime is 21095897. The reversal of 21095895 is 59859012.

It is a de Polignac number, because none of the positive numbers 2^k-21095895 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21095897) 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, 41110 + ... + 41619.

It is an arithmetic number, because the mean of its divisors is an integer number (2233710).

Almost surely, 2^21095895 is an apocalyptic number.

21095895 is a deficient number, since it is larger than the sum of its proper divisors (14643465).

21095895 is a wasteful number, since it uses less digits than its factorization.

21095895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82754.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 21095895 is about 4593.0267798044. The cubic root of 21095895 is about 276.3117277073.

The spelling of 21095895 in words is "twenty-one million, ninety-five thousand, eight hundred ninety-five".