21595452 has 12 divisors (see below), whose sum is σ = 50389416. Its totient is φ = 7198480.

The previous prime is 21595439. The next prime is 21595463. The reversal of 21595452 is 25459512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 899799 + ... + 899822.

It is an arithmetic number, because the mean of its divisors is an integer number (4199118).

Almost surely, 2^21595452 is an apocalyptic number.

It is an amenable number.

21595452 is an abundant number, since it is smaller than the sum of its proper divisors (28793964).

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

21595452 is a wasteful number, since it uses less digits than its factorization.

21595452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799628 (or 1799626 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 21595452 is about 4647.0907027946. The cubic root of 21595452 is about 278.4757823984.

The spelling of 21595452 in words is "twenty-one million, five hundred ninety-five thousand, four hundred fifty-two".