27921484889 has 2 divisors, whose sum is σ = 27921484890. Its totient is φ = 27921484888.

The previous prime is 27921484853. The next prime is 27921484999. The reversal of 27921484889 is 98848412972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15212755600 + 12708729289 = 123340^2 + 112733^2 .

It is a cyclic number.

It is not a de Polignac number, because 27921484889 - 2²⁸ = 27653049433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27921484819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13960742444 + 13960742445.

It is an arithmetic number, because the mean of its divisors is an integer number (13960742445).

Almost surely, 2^27921484889 is an apocalyptic number.

It is an amenable number.

27921484889 is a deficient number, since it is larger than the sum of its proper divisors (1).

27921484889 is an equidigital number, since it uses as much as digits as its factorization.

27921484889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18579456, while the sum is 62.

The spelling of 27921484889 in words is "twenty-seven billion, nine hundred twenty-one million, four hundred eighty-four thousand, eight hundred eighty-nine".