21109132 has 12 divisors (see below), whose sum is σ = 40299336. Its totient is φ = 9595040.

The previous prime is 21109117. The next prime is 21109139. The reversal of 21109132 is 23190112.

It is not an unprimeable number, because it can be changed into a prime (21109139) 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, 239833 + ... + 239920.

It is an arithmetic number, because the mean of its divisors is an integer number (3358278).

Almost surely, 2^21109132 is an apocalyptic number.

21109132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21109132 is a deficient number, since it is larger than the sum of its proper divisors (19190204).

21109132 is a wasteful number, since it uses less digits than its factorization.

21109132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479768 (or 479766 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 21109132 is about 4594.4675425995. The cubic root of 21109132 is about 276.3695078838.

Adding to 21109132 its reverse (23190112), we get a palindrome (44299244).

The spelling of 21109132 in words is "twenty-one million, one hundred nine thousand, one hundred thirty-two".