21106732 has 24 divisors (see below), whose sum is σ = 39184992. Its totient is φ = 9926400.

The previous prime is 21106721. The next prime is 21106763. The reversal of 21106732 is 23760112.

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 7 ways as a sum of consecutive naturals, for example, 3732 + ... + 7492.

It is an arithmetic number, because the mean of its divisors is an integer number (1632708).

Almost surely, 2^21106732 is an apocalyptic number.

It is an amenable number.

21106732 is a deficient number, since it is larger than the sum of its proper divisors (18078260).

21106732 is a wasteful number, since it uses less digits than its factorization.

21106732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849 (or 3847 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21106732 is about 4594.2063514823. The cubic root of 21106732 is about 276.3590335552.

Adding to 21106732 its reverse (23760112), we get a palindrome (44866844).

The spelling of 21106732 in words is "twenty-one million, one hundred six thousand, seven hundred thirty-two".