12121321121 has 8 divisors (see below), whose sum is σ = 14918549184. Its totient is φ = 9590495760.

The previous prime is 12121321117. The next prime is 12121321123. The reversal of 12121321121 is 12112312121.

It is a happy number.

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 12121321121 - 2² = 12121321117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121321121.

It is not an unprimeable number, because it can be changed into a prime (12121321123) 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, 66600575 + ... + 66600756.

It is an arithmetic number, because the mean of its divisors is an integer number (1864818648).

Almost surely, 2^12121321121 is an apocalyptic number.

It is an amenable number.

12121321121 is a deficient number, since it is larger than the sum of its proper divisors (2797228063).

12121321121 is a wasteful number, since it uses less digits than its factorization.

12121321121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133201351.

The product of its digits is 48, while the sum is 17.

Adding to 12121321121 its reverse (12112312121), we get a palindrome (24233633242).

The spelling of 12121321121 in words is "twelve billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred twenty-one".