213851135185 has 4 divisors (see below), whose sum is σ = 256621362228. Its totient is φ = 171080908144.

The previous prime is 213851135177. The next prime is 213851135203. The reversal of 213851135185 is 581531158312.

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 73794809104 + 140056326081 = 271652^2 + 374241^2 .

It is a cyclic number.

It is not a de Polignac number, because 213851135185 - 2³ = 213851135177 is a prime.

It is a Duffinian number.

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, 21385113514 + ... + 21385113523.

It is an arithmetic number, because the mean of its divisors is an integer number (64155340557).

Almost surely, 2^213851135185 is an apocalyptic number.

It is an amenable number.

213851135185 is a deficient number, since it is larger than the sum of its proper divisors (42770227043).

213851135185 is an equidigital number, since it uses as much as digits as its factorization.

213851135185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42770227042.

The product of its digits is 144000, while the sum is 43.

The spelling of 213851135185 in words is "two hundred thirteen billion, eight hundred fifty-one million, one hundred thirty-five thousand, one hundred eighty-five".