2021866685 has 8 divisors (see below), whose sum is σ = 2427291360. Its totient is φ = 1616792464.

The previous prime is 2021866673. The next prime is 2021866709. The reversal of 2021866685 is 5866681202.

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 2021866685 - 2⁶ = 2021866621 is a prime.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 74747 + ... + 98136.

It is an arithmetic number, because the mean of its divisors is an integer number (303411420).

Almost surely, 2^2021866685 is an apocalyptic number.

It is an amenable number.

2021866685 is a deficient number, since it is larger than the sum of its proper divisors (405424675).

2021866685 is a wasteful number, since it uses less digits than its factorization.

2021866685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175227.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 2021866685 is about 44965.1719111581. The cubic root of 2021866685 is about 1264.4961326573.

The spelling of 2021866685 in words is "two billion, twenty-one million, eight hundred sixty-six thousand, six hundred eighty-five".