21071666032 has 20 divisors (see below), whose sum is σ = 40829006320. Its totient is φ = 10535148288.

The previous prime is 21071666003. The next prime is 21071666051. The reversal of 21071666032 is 23066617012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289069 + ... + 354547.

It is an arithmetic number, because the mean of its divisors is an integer number (2041450316).

Almost surely, 2^21071666032 is an apocalyptic number.

It is an amenable number.

21071666032 is a deficient number, since it is larger than the sum of its proper divisors (19757340288).

21071666032 is a wasteful number, since it uses less digits than its factorization.

21071666032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85600 (or 85594 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 21071666032 in words is "twenty-one billion, seventy-one million, six hundred sixty-six thousand, thirty-two".