21330032 has 20 divisors (see below), whose sum is σ = 41422200. Its totient is φ = 10640448.

The previous prime is 21329999. The next prime is 21330047. The reversal of 21330032 is 23003312.

It is a junction number, because it is equal to n+sod(n) for n = 21329989 and 21330016.

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, 7094 + ... + 9642.

It is an arithmetic number, because the mean of its divisors is an integer number (2071110).

Almost surely, 2^21330032 is an apocalyptic number.

It is an amenable number.

21330032 is a deficient number, since it is larger than the sum of its proper divisors (20092168).

21330032 is a wasteful number, since it uses less digits than its factorization.

21330032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080 (or 3074 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 21330032 is about 4618.4447598732. Note that the first 3 decimals coincide. The cubic root of 21330032 is about 277.3302026479.

Adding to 21330032 its reverse (23003312), we get a palindrome (44333344).

The spelling of 21330032 in words is "twenty-one million, three hundred thirty thousand, thirty-two".