121221212010121 has 4 divisors (see below), whose sum is σ = 121226852063812. Its totient is φ = 121215571956432.

The previous prime is 121221212010043. The next prime is 121221212010167. The reversal of 121221212010121 is 121010212122121.

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 15299323759225 + 105921888250896 = 3911435^2 + 10291836^2 .

It is a cyclic number.

It is not a de Polignac number, because 121221212010121 - 2²⁹ = 121220675139209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221212010191) 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, 2819994606 + ... + 2820037591.

It is an arithmetic number, because the mean of its divisors is an integer number (30306713015953).

Almost surely, 2^{121221212010121} is an apocalyptic number.

It is an amenable number.

121221212010121 is a deficient number, since it is larger than the sum of its proper divisors (5640053691).

121221212010121 is an equidigital number, since it uses as much as digits as its factorization.

121221212010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5640053690.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121221212010121 its reverse (121010212122121), we get a palindrome (242231424132242).

The spelling of 121221212010121 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, ten thousand, one hundred twenty-one".