21673832 has 16 divisors (see below), whose sum is σ = 42777600. Its totient is φ = 10266480.

The previous prime is 21673831. The next prime is 21673837. The reversal of 21673832 is 23837612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21673831) 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 in 3 ways as a sum of consecutive naturals, for example, 71144 + ... + 71447.

It is an arithmetic number, because the mean of its divisors is an integer number (2673600).

Almost surely, 2^21673832 is an apocalyptic number.

It is an amenable number.

21673832 is a deficient number, since it is larger than the sum of its proper divisors (21103768).

21673832 is a wasteful number, since it uses less digits than its factorization.

21673832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142616 (or 142612 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 21673832 is about 4655.5162978987. The cubic root of 21673832 is about 278.8122819266.

The spelling of 21673832 in words is "twenty-one million, six hundred seventy-three thousand, eight hundred thirty-two".