27121958705 has 4 divisors (see below), whose sum is σ = 32546350452. Its totient is φ = 21697566960.

The previous prime is 27121958581. The next prime is 27121958711. The reversal of 27121958705 is 50785912172.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19693070224 + 7428888481 = 140332^2 + 86191^2 .

It is not a de Polignac number, because 27121958705 - 2²⁰ = 27120910129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27121958705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2712195866 + ... + 2712195875.

It is an arithmetic number, because the mean of its divisors is an integer number (8136587613).

Almost surely, 2^27121958705 is an apocalyptic number.

It is an amenable number.

27121958705 is a deficient number, since it is larger than the sum of its proper divisors (5424391747).

27121958705 is an equidigital number, since it uses as much as digits as its factorization.

27121958705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5424391746.

The product of its (nonzero) digits is 352800, while the sum is 47.

The spelling of 27121958705 in words is "twenty-seven billion, one hundred twenty-one million, nine hundred fifty-eight thousand, seven hundred five".