21996066 has 8 divisors (see below), whose sum is σ = 43992144. Its totient is φ = 7332020.

The previous prime is 21996041. The next prime is 21996077. The reversal of 21996066 is 66069912.

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

21996066 is an admirable 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, 1833000 + ... + 1833011.

It is an arithmetic number, because the mean of its divisors is an integer number (5499018).

Almost surely, 2^21996066 is an apocalyptic number.

21996066 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.

21996066 is a wasteful number, since it uses less digits than its factorization.

21996066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3666016.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 21996066 is about 4689.9963752651. The cubic root of 21996066 is about 280.1872302173.

The spelling of 21996066 in words is "twenty-one million, nine hundred ninety-six thousand, sixty-six".