20212686664671 has 8 divisors (see below), whose sum is σ = 26969134840704. Its totient is φ = 13465681465880.

The previous prime is 20212686664661. The next prime is 20212686664711. The reversal of 20212686664671 is 17646668621202.

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

It is a cyclic number.

It is not a de Polignac number, because 20212686664671 - 2¹⁵ = 20212686631903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212686664661) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2360739315 + ... + 2360747876.

It is an arithmetic number, because the mean of its divisors is an integer number (3371141855088).

Almost surely, 2^{20212686664671} is an apocalyptic number.

20212686664671 is a deficient number, since it is larger than the sum of its proper divisors (6756448176033).

20212686664671 is a wasteful number, since it uses less digits than its factorization.

20212686664671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721488621.

The product of its (nonzero) digits is 13934592, while the sum is 57.

The spelling of 20212686664671 in words is "twenty trillion, two hundred twelve billion, six hundred eighty-six million, six hundred sixty-four thousand, six hundred seventy-one".