212122542165 has 16 divisors (see below), whose sum is σ = 341292139200. Its totient is φ = 112499998592.

The previous prime is 212122542161. The next prime is 212122542167. The reversal of 212122542165 is 561245221212.

It is a cyclic number.

It is not a de Polignac number, because 212122542165 - 2² = 212122542161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122542161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39498720 + ... + 39504089.

It is an arithmetic number, because the mean of its divisors is an integer number (21330758700).

Almost surely, 2^212122542165 is an apocalyptic number.

It is an amenable number.

212122542165 is a deficient number, since it is larger than the sum of its proper divisors (129169597035).

212122542165 is a wasteful number, since it uses less digits than its factorization.

212122542165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79002996.

The product of its digits is 19200, while the sum is 33.

Adding to 212122542165 its reverse (561245221212), we get a palindrome (773367763377).

The spelling of 212122542165 in words is "two hundred twelve billion, one hundred twenty-two million, five hundred forty-two thousand, one hundred sixty-five".