21095888 has 40 divisors (see below), whose sum is σ = 45279840. Its totient is φ = 9440640.

The previous prime is 21095881. The next prime is 21095897. The reversal of 21095888 is 88859012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21095881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10898 + ... + 12686.

It is an arithmetic number, because the mean of its divisors is an integer number (1131996).

Almost surely, 2^21095888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21095888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22639920).

21095888 is an abundant number, since it is smaller than the sum of its proper divisors (24183952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21095888 is a wasteful number, since it uses less digits than its factorization.

21095888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875 (or 1869 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 21095888 is about 4593.0260177796. The cubic root of 21095888 is about 276.3116971456.

It can be divided in two parts, 2109 and 5888, that added together give a palindrome (7997).

The spelling of 21095888 in words is "twenty-one million, ninety-five thousand, eight hundred eighty-eight".