21196866 has 8 divisors (see below), whose sum is σ = 42393744. Its totient is φ = 7065620.

The previous prime is 21196853. The next prime is 21196891. The reversal of 21196866 is 66869112.

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

21196866 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, 1766400 + ... + 1766411.

It is an arithmetic number, because the mean of its divisors is an integer number (5299218).

Almost surely, 2^21196866 is an apocalyptic number.

21196866 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.

21196866 is a wasteful number, since it uses less digits than its factorization.

21196866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532816.

The product of its digits is 31104, while the sum is 39.

The square root of 21196866 is about 4604.0054300576. The cubic root of 21196866 is about 276.7518619581.

The spelling of 21196866 in words is "twenty-one million, one hundred ninety-six thousand, eight hundred sixty-six".