212104161 has 6 divisors (see below), whose sum is σ = 306372690. Its totient is φ = 141402768.

The previous prime is 212104159. The next prime is 212104169. The reversal of 212104161 is 161401212.

212104161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 111703761 + 100400400 = 10569^2 + 10020^2 .

It is not a de Polignac number, because 212104161 - 2¹ = 212104159 is a prime.

It is a super-2 number, since 2×212104161² = 89976350227027842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212104169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11783556 + ... + 11783573.

It is an arithmetic number, because the mean of its divisors is an integer number (51062115).

Almost surely, 2^212104161 is an apocalyptic number.

It is an amenable number.

212104161 is a deficient number, since it is larger than the sum of its proper divisors (94268529).

212104161 is a wasteful number, since it uses less digits than its factorization.

212104161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23567135 (or 23567132 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 212104161 is about 14563.7962427384. The cubic root of 212104161 is about 596.3708345217.

Adding to 212104161 its reverse (161401212), we get a palindrome (373505373).

The spelling of 212104161 in words is "two hundred twelve million, one hundred four thousand, one hundred sixty-one".