21595125 has 16 divisors (see below), whose sum is σ = 35934912. Its totient is φ = 11517200.

The previous prime is 21595103. The next prime is 21595129. The reversal of 21595125 is 52159512.

It is not a de Polignac number, because 21595125 - 2⁷ = 21594997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21595092 and 21595101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21595129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28419 + ... + 29168.

It is an arithmetic number, because the mean of its divisors is an integer number (2245932).

Almost surely, 2^21595125 is an apocalyptic number.

21595125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21595125 is a deficient number, since it is larger than the sum of its proper divisors (14339787).

21595125 is an equidigital number, since it uses as much as digits as its factorization.

21595125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57605 (or 57595 counting only the distinct ones).

The product of its digits is 4500, while the sum is 30.

The square root of 21595125 is about 4647.0555193585. The cubic root of 21595125 is about 278.4743768241.

The spelling of 21595125 in words is "twenty-one million, five hundred ninety-five thousand, one hundred twenty-five".