27129121185 has 32 divisors (see below), whose sum is σ = 44467061760. Its totient is φ = 14116148928.

The previous prime is 27129121141. The next prime is 27129121189. The reversal of 27129121185 is 58112192172.

It is not a de Polignac number, because 27129121185 - 2⁸ = 27129120929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27129121189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 548406 + ... + 595824.

It is an arithmetic number, because the mean of its divisors is an integer number (1389595680).

Almost surely, 2^27129121185 is an apocalyptic number.

It is an amenable number.

27129121185 is a deficient number, since it is larger than the sum of its proper divisors (17337940575).

27129121185 is a wasteful number, since it uses less digits than its factorization.

27129121185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48357.

The product of its digits is 20160, while the sum is 39.

The spelling of 27129121185 in words is "twenty-seven billion, one hundred twenty-nine million, one hundred twenty-one thousand, one hundred eighty-five".