27121758117 has 4 divisors (see below), whose sum is σ = 36162344160. Its totient is φ = 18081172076.

The previous prime is 27121758089. The next prime is 27121758133. The reversal of 27121758117 is 71185712172.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27121758117 - 2¹⁰ = 27121757093 is a prime.

It is a super-3 number, since 3×27121758117³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27121748117) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4520293017 + ... + 4520293022.

It is an arithmetic number, because the mean of its divisors is an integer number (9040586040).

Almost surely, 2^27121758117 is an apocalyptic number.

It is an amenable number.

27121758117 is a deficient number, since it is larger than the sum of its proper divisors (9040586043).

27121758117 is an equidigital number, since it uses as much as digits as its factorization.

27121758117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9040586042.

The product of its digits is 54880, while the sum is 42.

The spelling of 27121758117 in words is "twenty-seven billion, one hundred twenty-one million, seven hundred fifty-eight thousand, one hundred seventeen".