121212102112121 has 4 divisors (see below), whose sum is σ = 121212176993700. Its totient is φ = 121212027230544.

The previous prime is 121212102112093. The next prime is 121212102112181. The reversal of 121212102112121 is 121211201212121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6766267452025 + 114445834660096 = 2601205^2 + 10697936^2 .

It is a cyclic number.

It is not a de Polignac number, because 121212102112121 - 2¹⁸ = 121212101849977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121212102112093 and 121212102112102.

It is not an unprimeable number, because it can be changed into a prime (121212102112181) 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, 34957826 + ... + 38268443.

It is an arithmetic number, because the mean of its divisors is an integer number (30303044248425).

Almost surely, 2^{121212102112121} is an apocalyptic number.

It is an amenable number.

121212102112121 is a deficient number, since it is larger than the sum of its proper divisors (74881579).

121212102112121 is an equidigital number, since it uses as much as digits as its factorization.

121212102112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74881578.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121212102112121 its reverse (121211201212121), we get a palindrome (242423303324242).

The spelling of 121212102112121 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred two million, one hundred twelve thousand, one hundred twenty-one".