121211110211121 has 12 divisors (see below), whose sum is σ = 200094531142272. Its totient is φ = 69263491549176.

The previous prime is 121211110211111. The next prime is 121211110211131. The reversal of 121211110211121 is 121112011112121.

121211110211121 is a `hidden beast` number, since 1 + 212 + 11 + 110 + 211 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (121211110211111) and next prime (121211110211131).

It is not a de Polignac number, because 121211110211121 - 2³⁸ = 120936232304177 is a prime.

It is a super-2 number, since 2×121211110211121² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121211110211094 and 121211110211103.

It is not an unprimeable number, because it can be changed into a prime (121211110211101) 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, 961992938121 + ... + 961992938246.

It is an arithmetic number, because the mean of its divisors is an integer number (16674544261856).

Almost surely, 2^{121211110211121} is an apocalyptic number.

It is an amenable number.

121211110211121 is a deficient number, since it is larger than the sum of its proper divisors (78883420931151).

121211110211121 is a wasteful number, since it uses less digits than its factorization.

121211110211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923985876380 (or 1923985876377 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 121211110211121 its reverse (121112011112121), we get a palindrome (242323121323242).

The spelling of 121211110211121 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred ten million, two hundred eleven thousand, one hundred twenty-one".