213110181 has 12 divisors (see below), whose sum is σ = 325933452. Its totient is φ = 133716096.

The previous prime is 213110171. The next prime is 213110189. The reversal of 213110181 is 181011312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 122213025 + 90897156 = 11055^2 + 9534^2 .

It is not a de Polignac number, because 213110181 - 2⁹ = 213109669 is a prime.

It is a super-2 number, since 2×213110181² = 90831898491705522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213110189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 696286 + ... + 696591.

It is an arithmetic number, because the mean of its divisors is an integer number (27161121).

Almost surely, 2^213110181 is an apocalyptic number.

It is an amenable number.

213110181 is a deficient number, since it is larger than the sum of its proper divisors (112823271).

213110181 is a wasteful number, since it uses less digits than its factorization.

213110181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392900 (or 1392897 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 213110181 is about 14598.2937701637. The cubic root of 213110181 is about 597.3122193708.

Adding to 213110181 its reverse (181011312), we get a palindrome (394121493).

The spelling of 213110181 in words is "two hundred thirteen million, one hundred ten thousand, one hundred eighty-one".