21103132 has 12 divisors (see below), whose sum is σ = 37436896. Its totient is φ = 10406880.

The previous prime is 21103127. The next prime is 21103139. The reversal of 21103132 is 23130112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103139) by changing a digit.

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, 35844 + ... + 36427.

Almost surely, 2^21103132 is an apocalyptic number.

It is an amenable number.

21103132 is a deficient number, since it is larger than the sum of its proper divisors (16333764).

21103132 is a wasteful number, since it uses less digits than its factorization.

21103132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72348 (or 72346 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21103132 is about 4593.8145369616. The cubic root of 21103132 is about 276.3433205734.

Adding to 21103132 its reverse (23130112), we get a palindrome (44233244).

The spelling of 21103132 in words is "twenty-one million, one hundred three thousand, one hundred thirty-two".