121212110121 has 4 divisors (see below), whose sum is σ = 161616146832. Its totient is φ = 80808073412.

The previous prime is 121212110111. The next prime is 121212110177. The reversal of 121212110121 is 121011212121.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121011212121 = 3 ⋅40337070707.

It is a cyclic number.

It is not a de Polignac number, because 121212110121 - 2⁹ = 121212109609 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121212110121.

It is not an unprimeable number, because it can be changed into a prime (121212110101) 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, 20202018351 + ... + 20202018356.

It is an arithmetic number, because the mean of its divisors is an integer number (40404036708).

Almost surely, 2^121212110121 is an apocalyptic number.

It is an amenable number.

121212110121 is a deficient number, since it is larger than the sum of its proper divisors (40404036711).

121212110121 is an equidigital number, since it uses as much as digits as its factorization.

121212110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40404036710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121212110121 its reverse (121011212121), we get a palindrome (242223322242).

The spelling of 121212110121 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, one hundred twenty-one".