21242032 has 20 divisors (see below), whose sum is σ = 47036176. Its totient is φ = 9103680.

The previous prime is 21241991. The next prime is 21242047. The reversal of 21242032 is 23024212.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21241997 and 21242015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94719 + ... + 94942.

Almost surely, 2^21242032 is an apocalyptic number.

It is an amenable number.

21242032 is an abundant number, since it is smaller than the sum of its proper divisors (25794144).

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

21242032 is a wasteful number, since it uses less digits than its factorization.

21242032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189676 (or 189670 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21242032 is about 4608.9078966714. The cubic root of 21242032 is about 276.9482889043.

Adding to 21242032 its reverse (23024212), we get a palindrome (44266244).

The spelling of 21242032 in words is "twenty-one million, two hundred forty-two thousand, thirty-two".