12121111012121 has 4 divisors (see below), whose sum is σ = 12145208648832. Its totient is φ = 12097013375412.

The previous prime is 12121111012103. The next prime is 12121111012123. The reversal of 12121111012121 is 12121011112121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121111012121 is a prime.

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 12121111012121.

It is not an unprimeable number, because it can be changed into a prime (12121111012123) 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, 12048817601 + ... + 12048818606.

It is an arithmetic number, because the mean of its divisors is an integer number (3036302162208).

Almost surely, 2^{12121111012121} is an apocalyptic number.

It is an amenable number.

12121111012121 is a deficient number, since it is larger than the sum of its proper divisors (24097636711).

12121111012121 is an equidigital number, since it uses as much as digits as its factorization.

12121111012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24097636710.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12121111012121 its reverse (12121011112121), we get a palindrome (24242122124242).

The spelling of 12121111012121 in words is "twelve trillion, one hundred twenty-one billion, one hundred eleven million, twelve thousand, one hundred twenty-one".