12102161 has 4 divisors (see below), whose sum is σ = 12213300. Its totient is φ = 11991024.

The previous prime is 12102157. The next prime is 12102199. The reversal of 12102161 is 16120121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16120121 = 787 ⋅20483.

It can be written as a sum of positive squares in 2 ways, for example, as 4177936 + 7924225 = 2044^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102161 - 2² = 12102157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12102151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55406 + ... + 55623.

It is an arithmetic number, because the mean of its divisors is an integer number (3053325).

Almost surely, 2^12102161 is an apocalyptic number.

It is an amenable number.

12102161 is a deficient number, since it is larger than the sum of its proper divisors (111139).

12102161 is a wasteful number, since it uses less digits than its factorization.

12102161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111138.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 12102161 is about 3478.8160342277. The cubic root of 12102161 is about 229.5907087601.

Adding to 12102161 its reverse (16120121), we get a palindrome (28222282).

The spelling of 12102161 in words is "twelve million, one hundred two thousand, one hundred sixty-one".