27121851859 has 4 divisors (see below), whose sum is σ = 28057088160. Its totient is φ = 26186615560.

The previous prime is 27121851797. The next prime is 27121851877. The reversal of 27121851859 is 95815812172.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 27121851859 - 2³³ = 18531917267 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27121801859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467618107 + ... + 467618164.

It is an arithmetic number, because the mean of its divisors is an integer number (7014272040).

Almost surely, 2^27121851859 is an apocalyptic number.

27121851859 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

27121851859 is a deficient number, since it is larger than the sum of its proper divisors (935236301).

27121851859 is an equidigital number, since it uses as much as digits as its factorization.

27121851859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935236300.

The product of its digits is 403200, while the sum is 49.

The spelling of 27121851859 in words is "twenty-seven billion, one hundred twenty-one million, eight hundred fifty-one thousand, eight hundred fifty-nine".