21166136 has 16 divisors (see below), whose sum is σ = 39831000. Its totient is φ = 10544544.

The previous prime is 21166129. The next prime is 21166147. The reversal of 21166136 is 63166112.

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, 2411 + ... + 6938.

Almost surely, 2^21166136 is an apocalyptic number.

It is an amenable number.

21166136 is a deficient number, since it is larger than the sum of its proper divisors (18664864).

21166136 is a wasteful number, since it uses less digits than its factorization.

21166136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9638 (or 9634 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 21166136 is about 4600.6669081776. Note that the first 3 decimals coincide. The cubic root of 21166136 is about 276.6180576203.

The spelling of 21166136 in words is "twenty-one million, one hundred sixty-six thousand, one hundred thirty-six".