121210212110121 has 12 divisors (see below), whose sum is σ = 175081518188148. Its totient is φ = 80806761598464.

The previous prime is 121210212110093. The next prime is 121210212110131. The reversal of 121210212110121 is 121011212012121.

It is a happy number.

121210212110121 is a `hidden beast` number, since 1 + 212 + 10 + 212 + 110 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 109285697840400 + 11924514269721 = 10453980^2 + 3453189^2 .

It is not a de Polignac number, because 121210212110121 - 2⁵ = 121210212110089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121210212110094 and 121210212110103.

It is not an unprimeable number, because it can be changed into a prime (121210212110131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21162561 + ... + 26273073.

It is an arithmetic number, because the mean of its divisors is an integer number (14590126515679).

Almost surely, 2^{121210212110121} is an apocalyptic number.

It is an amenable number.

121210212110121 is a deficient number, since it is larger than the sum of its proper divisors (53871306078027).

121210212110121 is a wasteful number, since it uses less digits than its factorization.

121210212110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7745832 (or 7745829 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121210212110121 its reverse (121011212012121), we get a palindrome (242221424122242).

The spelling of 121210212110121 in words is "one hundred twenty-one trillion, two hundred ten billion, two hundred twelve million, one hundred ten thousand, one hundred twenty-one".