21066500706 has 32 divisors (see below), whose sum is σ = 43025083200. Its totient is φ = 6874475520.

The previous prime is 21066500687. The next prime is 21066500713. The reversal of 21066500706 is 60700566012.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 38151 + ... + 208778.

It is an arithmetic number, because the mean of its divisors is an integer number (1344533850).

Almost surely, 2^21066500706 is an apocalyptic number.

21066500706 is an abundant number, since it is smaller than the sum of its proper divisors (21958582494).

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

21066500706 is a wasteful number, since it uses less digits than its factorization.

21066500706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247234.

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 21066500706 in words is "twenty-one billion, sixty-six million, five hundred thousand, seven hundred six".