27864952180021 has 16 divisors (see below), whose sum is σ = 30624949313280. Its totient is φ = 25142817934080.

The previous prime is 27864952180007. The next prime is 27864952180129. The reversal of 27864952180021 is 12008125946872.

It is not a de Polignac number, because 27864952180021 - 2⁷ = 27864952179893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27864952181021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7881940 + ... + 10856098.

It is an arithmetic number, because the mean of its divisors is an integer number (1914059332080).

Almost surely, 2^{27864952180021} is an apocalyptic number.

It is an amenable number.

27864952180021 is a deficient number, since it is larger than the sum of its proper divisors (2759997133259).

27864952180021 is a wasteful number, since it uses less digits than its factorization.

27864952180021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980524.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 27864952180021 in words is "twenty-seven trillion, eight hundred sixty-four billion, nine hundred fifty-two million, one hundred eighty thousand, twenty-one".