21175734066 has 8 divisors (see below), whose sum is σ = 42351468144. Its totient is φ = 7058578020.

The previous prime is 21175734031. The next prime is 21175734071. The reversal of 21175734066 is 66043757112.

It is a happy number.

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

21175734066 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1764644500 + ... + 1764644511.

It is an arithmetic number, because the mean of its divisors is an integer number (5293933518).

Almost surely, 2^21175734066 is an apocalyptic number.

21175734066 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.

21175734066 is a wasteful number, since it uses less digits than its factorization.

21175734066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529289016.

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 21175734066 in words is "twenty-one billion, one hundred seventy-five million, seven hundred thirty-four thousand, sixty-six".