122110212121 has 4 divisors (see below), whose sum is σ = 122564153700. Its totient is φ = 121656270544.

The previous prime is 122110212113. The next prime is 122110212181. The reversal of 122110212121 is 121212011221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121212011221 = 7 ⋅17316001603.

It can be written as a sum of positive squares in 2 ways, for example, as 39950015625 + 82160196496 = 199875^2 + 286636^2 .

It is a cyclic number.

It is not a de Polignac number, because 122110212121 - 2³ = 122110212113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122110212095 and 122110212104.

It is not an unprimeable number, because it can be changed into a prime (122110212181) 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, 226970386 + ... + 226970923.

It is an arithmetic number, because the mean of its divisors is an integer number (30641038425).

Almost surely, 2^122110212121 is an apocalyptic number.

It is an amenable number.

122110212121 is a deficient number, since it is larger than the sum of its proper divisors (453941579).

122110212121 is an equidigital number, since it uses as much as digits as its factorization.

122110212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453941578.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 122110212121 its reverse (121212011221), we get a palindrome (243322223342).

Subtracting from 122110212121 its reverse (121212011221), we obtain a square (898200900 = 29970²).

The spelling of 122110212121 in words is "one hundred twenty-two billion, one hundred ten million, two hundred twelve thousand, one hundred twenty-one".