12102121121 has 16 divisors (see below), whose sum is σ = 12410496000. Its totient is φ = 11798696448.

The previous prime is 12102121099. The next prime is 12102121127. The reversal of 12102121121 is 12112120121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12102121121 is a prime.

It is a super-2 number, since 2×12102121121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102121096 and 12102121105.

It is not an unprimeable number, because it can be changed into a prime (12102121127) 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, 1998320 + ... + 2004366.

It is an arithmetic number, because the mean of its divisors is an integer number (775656000).

Almost surely, 2^12102121121 is an apocalyptic number.

It is an amenable number.

12102121121 is a deficient number, since it is larger than the sum of its proper divisors (308374879).

12102121121 is a wasteful number, since it uses less digits than its factorization.

12102121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6448.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12102121121 its reverse (12112120121), we get a palindrome (24214241242).

The spelling of 12102121121 in words is "twelve billion, one hundred two million, one hundred twenty-one thousand, one hundred twenty-one".