212136161 has 4 divisors (see below), whose sum is σ = 213024000. Its totient is φ = 211248324.

The previous prime is 212136139. The next prime is 212136179. The reversal of 212136161 is 161631212.

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 212136161 - 2²⁶ = 145027297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212136191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443561 + ... + 444038.

It is an arithmetic number, because the mean of its divisors is an integer number (53256000).

Almost surely, 2^212136161 is an apocalyptic number.

It is an amenable number.

212136161 is a deficient number, since it is larger than the sum of its proper divisors (887839).

212136161 is an equidigital number, since it uses as much as digits as its factorization.

212136161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887838.

The product of its digits is 432, while the sum is 23.

The square root of 212136161 is about 14564.8948159607. The cubic root of 212136161 is about 596.4008243578.

Adding to 212136161 its reverse (161631212), we get a palindrome (373767373).

The spelling of 212136161 in words is "two hundred twelve million, one hundred thirty-six thousand, one hundred sixty-one".