21176812 has 12 divisors (see below), whose sum is σ = 37921576. Its totient is φ = 10342080.

The previous prime is 21176809. The next prime is 21176833. The reversal of 21176812 is 21867112.

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, 61389 + ... + 61732.

Almost surely, 2^21176812 is an apocalyptic number.

It is an amenable number.

21176812 is a deficient number, since it is larger than the sum of its proper divisors (16744764).

21176812 is a wasteful number, since it uses less digits than its factorization.

21176812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123168 (or 123166 counting only the distinct ones).

The product of its digits is 1344, while the sum is 28.

The square root of 21176812 is about 4601.8270284747. The cubic root of 21176812 is about 276.6645576523.

The spelling of 21176812 in words is "twenty-one million, one hundred seventy-six thousand, eight hundred twelve".