21595242 has 8 divisors (see below), whose sum is σ = 43190496. Its totient is φ = 7198412.

The previous prime is 21595241. The next prime is 21595247. The reversal of 21595242 is 24259512.

It is a sphenic number, since it is the product of 3 distinct primes.

21595242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21595241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1799598 + ... + 1799609.

It is an arithmetic number, because the mean of its divisors is an integer number (5398812).

Almost surely, 2^21595242 is an apocalyptic number.

21595242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21595242 is a wasteful number, since it uses less digits than its factorization.

21595242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3599212.

The product of its digits is 7200, while the sum is 30.

The square root of 21595242 is about 4647.0681079580. The cubic root of 21595242 is about 278.4748797376.

The spelling of 21595242 in words is "twenty-one million, five hundred ninety-five thousand, two hundred forty-two".