21172800966 has 8 divisors (see below), whose sum is σ = 42345601944. Its totient is φ = 7057600320.

The previous prime is 21172800923. The next prime is 21172800973. The reversal of 21172800966 is 66900827112.

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

21172800966 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1764400075 + ... + 1764400086.

It is an arithmetic number, because the mean of its divisors is an integer number (5293200243).

Almost surely, 2^21172800966 is an apocalyptic number.

21172800966 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.

21172800966 is a wasteful number, since it uses less digits than its factorization.

21172800966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3528800166.

The product of its (nonzero) digits is 72576, while the sum is 42.

The spelling of 21172800966 in words is "twenty-one billion, one hundred seventy-two million, eight hundred thousand, nine hundred sixty-six".