12161616121 has 8 divisors (see below), whose sum is σ = 12806334080. Its totient is φ = 11517361488.

The previous prime is 12161616119. The next prime is 12161616127.

12161616121 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12161616121 - 2¹ = 12161616119 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12161616121.

It is not an unprimeable number, because it can be changed into a prime (12161616127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61281 + ... + 167566.

It is an arithmetic number, because the mean of its divisors is an integer number (1600791760).

Almost surely, 2^12161616121 is an apocalyptic number.

It is an amenable number.

12161616121 is a deficient number, since it is larger than the sum of its proper divisors (644717959).

12161616121 is a wasteful number, since it uses less digits than its factorization.

12161616121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231663.

The product of its digits is 864, while the sum is 28.

The spelling of 12161616121 in words is "twelve billion, one hundred sixty-one million, six hundred sixteen thousand, one hundred twenty-one".