21168066 has 8 divisors (see below), whose sum is σ = 42336144. Its totient is φ = 7056020.

The previous prime is 21168053. The next prime is 21168101. The reversal of 21168066 is 66086112.

It is a sphenic number, since it is the product of 3 distinct primes.

21168066 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1764000 + ... + 1764011.

It is an arithmetic number, because the mean of its divisors is an integer number (5292018).

Almost surely, 2^21168066 is an apocalyptic number.

21168066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21168066 is a wasteful number, since it uses less digits than its factorization.

21168066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3528016.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21168066 is about 4600.8766555951. The cubic root of 21168066 is about 276.6264650221.

The spelling of 21168066 in words is "twenty-one million, one hundred sixty-eight thousand, sixty-six".