21106032 has 20 divisors (see below), whose sum is σ = 54524040. Its totient is φ = 7035328.

The previous prime is 21105977. The next prime is 21106037. The reversal of 21106032 is 23060112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106037) 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, 219807 + ... + 219902.

It is an arithmetic number, because the mean of its divisors is an integer number (2726202).

Almost surely, 2^21106032 is an apocalyptic number.

It is an amenable number.

21106032 is an abundant number, since it is smaller than the sum of its proper divisors (33418008).

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

21106032 is a wasteful number, since it uses less digits than its factorization.

21106032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439720 (or 439714 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21106032 is about 4594.1301679426. The cubic root of 21106032 is about 276.3559783931.

Adding to 21106032 its reverse (23060112), we get a palindrome (44166144).

The spelling of 21106032 in words is "twenty-one million, one hundred six thousand, thirty-two".