21104632 has 16 divisors (see below), whose sum is σ = 39659760. Its totient is φ = 10528704.

The previous prime is 21104591. The next prime is 21104641. The reversal of 21104632 is 23640112.

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, 1188 + ... + 6604.

It is an arithmetic number, because the mean of its divisors is an integer number (2478735).

Almost surely, 2^21104632 is an apocalyptic number.

It is an amenable number.

21104632 is a deficient number, since it is larger than the sum of its proper divisors (18555128).

21104632 is a wasteful number, since it uses less digits than its factorization.

21104632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5910 (or 5906 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21104632 is about 4593.9777970730. The cubic root of 21104632 is about 276.3498678663.

Adding to 21104632 its reverse (23640112), we get a palindrome (44744744).

It can be divided in two parts, 21104 and 632, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 21104632 in words is "twenty-one million, one hundred four thousand, six hundred thirty-two".