21166832 has 10 divisors (see below), whose sum is σ = 41010768. Its totient is φ = 10583408.

The previous prime is 21166823. The next prime is 21166837. The reversal of 21166832 is 23866112.

It is a junction number, because it is equal to n+sod(n) for n = 21166795 and 21166804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661448 + ... + 661479.

Almost surely, 2^21166832 is an apocalyptic number.

It is an amenable number.

21166832 is a deficient number, since it is larger than the sum of its proper divisors (19843936).

21166832 is a wasteful number, since it uses less digits than its factorization.

21166832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322935 (or 1322929 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21166832 is about 4600.7425487632. The cubic root of 21166832 is about 276.6210895713.

The spelling of 21166832 in words is "twenty-one million, one hundred sixty-six thousand, eight hundred thirty-two".